12-letter words ending with R
Dive into the specific realm of 12-letter words that conclude with the letter R. This focused section reveals the fascinating ways in which words of this particular length, ending with R, contribute to the richness of the English language. Whether it's for expanding your vocabulary, solving puzzles, or simply for the love of words, discover how these terms uniquely blend length and ending sound.
| Word | Points | Definition | Sentence example |
|---|---|---|---|
| motherfucker | 26 | insulting terms of address for people who are stupid or irritating or ridiculous | - |
| photographer | 23 | someone who takes photographs professionally | - |
| commissioner | 18 | a government administrator | - |
| refrigerator | 16 | white goods in which food can be stored at low temperatures | - |
| investigator | 16 | a police officer who investigates crimes | - |
| manslaughter | 18 | homicide without malice aforethought | - |
| manufacturer | 19 | someone who manufactures something | - |
| cheeseburger | 20 | a hamburger with melted cheese on it | - |
| troublemaker | 20 | someone who deliberately stirs up trouble | - |
| entrepreneur | 14 | someone who organizes a business venture and assumes the risk for it | - |
| extinguisher | 23 | a manually operated device for extinguishing small fires | - |
| tranquilizer | 30 | a drug used to reduce stress or tension without reducing mental clarity | - |
| collaborator | 16 | someone who collaborates with an enemy occupying force | - |
| screenwriter | 17 | someone who writes screenplays | - |
| sledgehammer | 21 | beat with a sledgehammer | - |
| scriptwriter | 19 | someone who writes scripts for plays or movies or broadcast dramas | - |
| sportscaster | 16 | an announcer who reads sports news or describes sporting events | - |
| interstellar | 12 | between or among stars | the density of hydrogen in interplanetary and interstellar space |
| practitioner | 16 | someone who practices a learned profession | - |
| exterminator | 21 | someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | - |
| communicator | 20 | a person who communicates with others | - |
| stepdaughter | 19 | a daughter of your spouse by a former marriage | - |
| heartbreaker | 21 | a charming person who is irresponsible in emotional relationships | - |
| impersonator | 16 | someone who (fraudulently) assumes the appearance of another | - |
| chiropractor | 21 | a therapist who practices chiropractic | - |
| flamethrower | 23 | a weapon that squirts ignited fuel for several yards | - |
| teleprompter | 18 | a prompter for television performers | - |
| schoolmaster | 19 | food fish of warm Caribbean and Atlantic waters | - |
| pornographer | 20 | someone who presents shows or sells writing or pictures that are sexually explicit in violation of the community mores | - |
| interrogator | 13 | a questioner who is excessively harsh | - |
| doppelganger | 19 | a ghostly double of a living person that haunts its living counterpart | - |
| amphitheater | 22 | a sloping gallery with seats for spectators (as in an operating room or theater) | - |
| conquistador | 24 | an adventurer (especially one who led the Spanish conquest of Mexico and Peru in the 16th century) | - |
| sharpshooter | 20 | someone skilled in shooting | - |
| stenographer | 18 | someone skilled in the transcription of speech (especially dictation) | - |
| confectioner | 19 | someone who makes candies and other sweets | - |
| experimenter | 23 | a person who enjoys testing innovative ideas | she was an experimenter in new forms of poetry |
| countertenor | 14 | the highest adult male singing voice | - |
| spectrometer | 18 | spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | - |
| calligrapher | 20 | someone skilled in penmanship | - |
| breathalyzer | 29 | a device that measures chemicals (especially the alcohol content) in a person's expired breath | - |
| streetwalker | 19 | a prostitute who attracts customers by walking the streets | - |
| demonstrator | 15 | someone who participates in a public display of group feeling | - |
| misbehaviour | 22 | improper or wicked or immoral behavior | - |
| skateboarder | 19 | someone who skates on a skateboard | - |
| cartographer | 20 | a person who makes maps | - |
| misdemeanour | 17 | a crime less serious than a felony | - |
| carpetbagger | 20 | an outsider who seeks power or success presumptuously | after the Civil War the carpetbaggers from the north tried to take over the south |
| counteroffer | 20 | an offer made by someone who has rejected a prior offer | - |
| restaurateur | 12 | the proprietor of a restaurant | - |
| sharecropper | 21 | small farmers and tenants | - |
| supercharger | 20 | compressor that forces increased oxygen into the cylinders of an internal-combustion engine | - |
| prizefighter | 30 | a professional boxer | - |
| eavesdropper | 20 | a secret listener to private conversations | - |
| straightener | 16 | a device for straightening | a hair straightener |
| weightlifter | 22 | an athlete who lifts barbells | - |
| globetrotter | 15 | someone who travels widely and often | - |
| interlocutor | 14 | the performer in the middle of a minstrel line who engages the others in talk | - |
| doubleheader | 19 | two games instead of one (especially in baseball when the same two teams play two games on the same day) | - |
| cabinetmaker | 22 | a woodworker who specializes in making furniture | - |
| breathalyser | 20 | a device that measures chemicals (especially the alcohol content) in a person's expired breath | - |
| velociraptor | 19 | small active carnivore that probably fed on protoceratops; possibly related more closely to birds than to other dinosaurs | - |
| overachiever | 23 | a student who attains higher standards than the IQ indicated | - |
| perambulator | 18 | a small vehicle with four wheels in which a baby or child is pushed around | - |
| headshrinker | 23 | - | - |
| katzenjammer | 36 | disagreeable aftereffects from the use of drugs (especially alcohol) | - |
| swashbuckler | 26 | a reckless impetuous irresponsible person | - |
| wicketkeeper | 27 | - | - |
| magnetometer | 17 | a meter to compare strengths of magnetic fields | - |
| rubbernecker | 22 | a person who stares inquisitively | - |
| sportswriter | 17 | a journalist who writes about sports | - |
| transgressor | 13 | someone who transgresses; someone who violates a law or command | the way of transgressors is hard |
| turbocharger | 20 | - | - |
| orchestrator | 17 | an arranger who writes for orchestras | - |
| assassinator | 12 | a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | assassinators of kings and emperors |
| candleholder | 19 | - | - |
| concentrator | 16 | - | - |
| scenographer | 20 | - | - |
| synchronizer | 29 | an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines) | - |
| quadrangular | 23 | of or relating to or shaped like a quadrangle | - |
| epicuticular | 18 | - | - |
| equilibrator | 23 | - | - |
| enfranchiser | 20 | - | - |
| endosmometer | 17 | - | - |
| encumbrancer | 20 | - | - |
| expectorator | 23 | a person who spits (ejects saliva or phlegm from the mouth) | - |
| exhibitioner | 24 | someone who organizes an exhibit for others to see | - |
| extemporizer | 32 | - | - |
| extensimeter | 21 | - | - |
| extensometer | 21 | - | - |
| exteroceptor | 23 | any receptor that responds to stimuli outside the body | - |
| expostulator | 21 | - | - |
| extemporiser | 23 | - | - |
| expropriator | 23 | - | - |
| ethnographer | 21 | an anthropologist who does ethnography | - |
| everywhither | 27 | - | - |
| evaporimeter | 19 | - | - |
| evaporometer | 19 | an instrument that measures rate of evaporation of water | - |
| filibusterer | 17 | a legislator who gives long speeches in an effort to delay or obstruct legislation that he (or she) opposes | - |
| festivalgoer | 19 | - | - |
| flameproofer | 22 | - | - |
| familiariser | 17 | - | - |
| familiarizer | 26 | - | - |
| extranuclear | 21 | - | - |
| extrapolator | 21 | - | - |
| fennelflower | 21 | - | - |
| frontbencher | 22 | a member of the House of Commons who is a minister in the government or who holds an official position in an opposition party | - |
| galactometer | 17 | - | - |
| galvanometer | 18 | meter for detecting or comparing or measuring small electric currents | - |
| funambulator | 19 | - | - |
| foundationer | 16 | - | - |
| fractionator | 17 | - | - |
| foreshadower | 22 | - | - |
| formulariser | 17 | - | - |
| formularizer | 26 | - | - |
| grandstander | 15 | someone who performs with an eye to the applause from spectators in the grandstand | - |
| gossipmonger | 18 | a person given to gossiping and divulging personal information about others | - |
| gastrosopher | 18 | - | - |
| gesticulator | 15 | - | - |
| harbormaster | 19 | - | - |
| harquebusier | 26 | - | - |
| hasenpfeffer | 26 | - | - |
| harmonometer | 19 | - | - |
| hallucinator | 17 | - | - |
| handicrafter | 21 | - | - |
| heliographer | 21 | - | - |
| gubernacular | 17 | - | - |
| gravitometer | 18 | - | - |
| greenskeeper | 19 | someone responsible for the maintenance of a golf course | - |
| hairsplitter | 17 | a disputant who makes unreasonably fine distinctions | - |
| hagiographer | 22 | the author of a worshipful or idealizing biography | - |
| holidaymaker | 25 | someone who travels for pleasure | - |
| hierographer | 21 | - | - |
| hippocentaur | 21 | - | - |
| honeycreeper | 22 | small to medium-sized finches of the Hawaiian islands | - |
| homeschooler | 22 | - | - |
| hephthemimer | 27 | - | - |
| hyperreactor | 22 | - | - |
| hypothesiser | 23 | - | - |
| hypothesizer | 32 | - | - |
| iambographer | 22 | - | - |
| hypothecator | 25 | - | - |
| hydrocracker | 27 | - | - |
| horsewhipper | 25 | - | - |
| housepainter | 17 | - | - |
| housebreaker | 21 | a wrecker of houses | in England a housewrecker is called a housebreaker |
| hymnographer | 26 | - | - |
| hydrographer | 25 | - | - |
| hydrogenator | 20 | - | - |
| improvisator | 19 | - | - |
| impropriator | 18 | - | - |
| impoverisher | 22 | - | - |
| inclinometer | 16 | a measuring instrument for measuring the angle of magnetic dip (as from an airplane) | - |
| incarcerator | 16 | - | - |
| iconographer | 20 | - | - |
| immortalizer | 25 | - | - |
| immortaliser | 16 | - | - |
| infundibular | 18 | - | - |
| incriminator | 16 | - | - |
| incorporator | 16 | - | - |
| individuator | 17 | - | - |
| interpolater | 14 | - | - |
| interpolator | 14 | - | - |
| interpleader | 15 | - | - |
| intermeddler | 16 | - | - |
| interoceptor | 16 | any receptor that responds to stimuli inside the body | - |
| internuclear | 14 | - | - |
| intranuclear | 14 | - | - |
| intrapreneur | 14 | - | - |
| interchapter | 19 | - | - |
| intercluster | 14 | - | - |
| interchanger | 18 | - | - |
| interlaminar | 14 | - | - |
| interlobular | 14 | between lobes or lobules | - |
| justificator | 24 | - | - |
| klipspringer | 21 | - | - |
| kirschwasser | 24 | - | - |
| katharometer | 21 | measures thermal conductivity | - |
| isoperimeter | 16 | - | - |
| diverticular | 18 | - | - |
| domesticator | 17 | - | - |
| disorganizer | 23 | - | - |
| disorganiser | 14 | - | - |
| dissimulator | 15 | a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | - |
| dispossessor | 15 | - | - |
| disqualifier | 25 | - | - |
| disseminator | 15 | someone who spreads the news | - |
| electrotyper | 19 | - | - |
| electropolar | 16 | - | - |
| electrofluor | 17 | - | - |
| electrolyzer | 26 | - | - |
| electrometer | 16 | meter to measure electrostatic voltage differences; draws no current from the source | - |
| electromotor | 16 | - | - |
| electrolyser | 17 | - | - |
| empoverisher | 22 | - | - |
| effusiometer | 20 | - | - |
| ebulliometer | 16 | - | - |
| backgrounder | 22 | a press conference or interview in which a government official explains to reporters the background of an action or policy | the secretary gave us a backgrounder on public health issues |
| averruncator | 17 | - | - |
| baroreceptor | 18 | a sensory receptor that responds to pressure | - |
| balladmonger | 18 | - | - |
| biomolecular | 18 | - | - |
| beautifuller | 17 | - | - |
| basketweaver | 24 | someone skilled in weaving baskets | - |
| cackermander | 23 | - | - |
| campanologer | 19 | - | - |
| broncobuster | 18 | a person who breaks horses | - |
| boulevardier | 18 | a visitor of a city boulevard (especially in Paris) | - |
| bonnyclabber | 23 | - | - |
| brickfielder | 24 | - | - |
| breechloader | 20 | a gun that is loaded at the breech | - |
| brainstormer | 16 | - | - |
| brassfounder | 18 | - | - |
| breastsummer | 18 | - | - |
| cephalometer | 21 | - | - |
| cathetometer | 19 | - | - |
| carpetmonger | 19 | - | - |
| carillonneur | 14 | a musician who plays a carillon | - |
| circulariser | 16 | - | - |
| circularizer | 25 | - | - |
| circumcenter | 20 | - | - |
| circumventer | 21 | - | - |
| circumventor | 21 | - | - |
| chirographer | 23 | - | - |
| cheesecutter | 19 | - | - |
| cheesehopper | 24 | - | - |
| cheesemonger | 20 | someone who sells cheese | - |
| checkweigher | 30 | - | - |
| cheesetaster | 17 | - | - |
| choregrapher | 23 | - | - |
| chorographer | 23 | - | - |
| chorusmaster | 19 | - | - |
| chromocenter | 21 | - | - |
| chloroformer | 22 | - | - |
| commemorator | 20 | - | - |
| commiserator | 18 | - | - |
| complimenter | 20 | - | - |
| communaliser | 18 | - | - |
| communalizer | 27 | - | - |
| cocurricular | 18 | - | - |
| coachbuilder | 22 | a craftsman who makes the bodies of motor vehicles | - |
| codiscoverer | 20 | - | - |
| contaminator | 16 | - | - |
| contemplator | 18 | - | - |
| consolidator | 15 | - | - |
| concessioner | 16 | someone who holds or operates a concession | - |
| conferencier | 19 | - | - |
| confabulator | 19 | - | - |
| corroborator | 16 | - | - |
| cosmographer | 22 | a scientist knowledgeable about cosmography | - |
| costermonger | 17 | a hawker of fruit and vegetables from a barrow | - |
| coresearcher | 19 | - | - |
| correctioner | 16 | - | - |
| counterorder | 15 | - | - |
| counterpower | 19 | - | - |
| countenancer | 16 | - | - |
| coulombmeter | 20 | - | - |
| contradicter | 17 | - | - |
| contradictor | 17 | - | - |
| controverter | 17 | - | - |
| coproprietor | 18 | - | - |
| conventioner | 17 | - | - |
| conventicler | 19 | - | - |
| crystalliser | 17 | - | - |
| crystallizer | 26 | - | - |
| cuckooflower | 26 | a bitter cress of Europe and America | - |
| crossbencher | 21 | a member of the House of Commons who does not vote regularly with either the government or the Opposition | - |
| dehumidifier | 22 | an applicance to extract moisture from the air and make the environment more comfortable | in summer, we need to run the dehumidifier in the basement |
| demagnetizer | 25 | - | - |
| demagnetiser | 16 | - | - |
| democratizer | 26 | - | - |
| democratiser | 17 | - | - |
| declinometer | 17 | an instrument for measuring magnetic declination | - |
| decarboniser | 17 | - | - |
| decarbonizer | 26 | - | - |
| decarbonator | 17 | - | - |
| decompressor | 19 | - | - |
| decorticator | 17 | - | - |
| determinator | 15 | - | - |
| destabiliser | 15 | - | - |
| destabilizer | 24 | - | - |
| diastereomer | 15 | - | - |
| dephlegmator | 21 | - | - |
| densitometer | 15 | a measuring instrument for determining density or specific gravity | - |
| desensitizer | 22 | - | - |
| desensitiser | 13 | - | - |
| deprogrammer | 20 | - | - |
| disconnecter | 17 | - | - |
| discontinuer | 15 | - | - |
| discographer | 21 | - | - |
| disenchanter | 18 | - | - |
| disassembler | 17 | - | - |
| animadverter | 18 | - | - |
| anthologiser | 16 | - | - |
| anthologizer | 25 | - | - |
| alphabetizer | 28 | a literate person who can arrange items in alphabetical order | - |
| alphabetiser | 19 | a literate person who can arrange items in alphabetical order | - |
| appropriator | 18 | someone who takes for his or her own use (especially without permission) | - |
| appendicular | 19 | relating to or consisting of an appendage or appendages; especially the limbs | the appendicular skeleton |
| arithmometer | 19 | - | - |
| antimacassar | 16 | a piece of ornamented cloth that protects the back of a chair from hair oils | - |
| anticonsumer | 16 | - | - |
| antipredator | 15 | - | - |
| antitakeover | 19 | - | - |
| agroforester | 16 | - | - |
| albumblatter | 18 | - | - |
| accomplisher | 23 | - | - |
| acclimatizer | 27 | - | - |
| accommodator | 21 | someone who performs a service or does a favor | - |
| acclimatiser | 18 | - | - |
| acknowledger | 23 | - | - |
| remembrancer | 20 | - | - |
| relinquisher | 24 | - | - |
| renovascular | 17 | - | - |
| remonstrator | 14 | - | - |
| redemptioner | 17 | - | - |
| rediscoverer | 18 | - | - |
| reverberator | 17 | - | - |
| rhythmometer | 25 | - | - |
| revolutioner | 15 | - | - |
| rheoreceptor | 19 | - | - |
| rhabdomancer | 22 | someone who uses a divining rod to find underground water | - |
| reprographer | 20 | - | - |
| resuscitator | 14 | a breathing apparatus used for resuscitation by forcing oxygen into the lungs of a person who has undergone asphyxia or arrest of respiration | - |
| respirometer | 16 | - | - |
| resolutioner | 12 | - | - |
| scarificator | 19 | - | - |
| schussboomer | 21 | - | - |
| scintillator | 14 | - | - |
| sceneshifter | 20 | a stagehand responsible for moving scenery | - |
| rodomontader | 16 | - | - |
| rollerblader | 15 | a skater who uses Rollerblades | - |
| sequestrator | 21 | - | - |
| sensorimotor | 14 | of or relating to the sensory and motor coordination of an organism or to the controlling nerves | - |
| sensitometer | 14 | a measuring instrument for measuring the light sensitivity of film over a range of exposures | - |
| sheepshearer | 20 | - | - |
| shellcracker | 23 | - | - |
| scrimshander | 20 | - | - |
| semicircular | 18 | curved into a half circle | - |
| semiglobular | 17 | - | - |
| semidiameter | 17 | the apparent radius of a celestial body when viewed as a disc from the earth | - |
| semicylinder | 20 | - | - |
| snobographer | 20 | - | - |
| snollygoster | 16 | - | - |
| slockdolager | 20 | - | - |
| slockdoliger | 20 | - | - |
| slockdologer | 20 | - | - |
| soliloquizer | 30 | - | - |
| soliloquiser | 21 | - | - |
| significator | 18 | - | - |
| shirtwaister | 18 | a blouse with buttons down the front | in Britain they call a shirtwaist a shirtwaister |
| shortchanger | 21 | - | - |
| skrimshanker | 25 | - | - |
| skeletonizer | 25 | - | - |
| skeletoniser | 16 | - | - |
| springkeeper | 21 | - | - |
| standardizer | 23 | a person who sets a standard for things to conform to | - |
| standardiser | 14 | a person who sets a standard for things to conform to | - |
| stabilisator | 14 | - | - |
| stabilizator | 23 | - | - |
| sphygmometer | 25 | - | - |
| specksioneer | 20 | - | - |
| specktioneer | 20 | - | - |
| spellchecker | 25 | - | - |
| speechwriter | 22 | a writer who composes speeches for others to deliver | - |
| stressbuster | 14 | - | - |
| strengthener | 16 | a device designed to provide additional strength | the cardboard backing was just a strengthener |
| stratotanker | 16 | - | - |
| streetkeeper | 18 | - | - |
| subauricular | 16 | - | - |
| stereoisomer | 14 | - | - |
| stickhandler | 22 | - | - |
| stockbreeder | 21 | - | - |
| supercluster | 16 | - | - |
| supercarrier | 16 | - | - |
| supplementer | 18 | - | - |
| superteacher | 19 | - | - |
| supernacular | 16 | - | - |
| superpolymer | 21 | - | - |
| suborbicular | 18 | - | - |
| subordinator | 15 | - | - |
| subopercular | 18 | - | - |
| subinspector | 18 | - | - |
| subtreasurer | 14 | - | - |
| subumbrellar | 18 | - | - |
| tachygrapher | 26 | - | - |
| systematizer | 26 | an organizer who puts things in order | - |
| tabernacular | 16 | - | - |
| systematiser | 17 | an organizer who puts things in order | - |
| telecommuter | 18 | - | - |
| telemarketer | 18 | - | - |
| technicolour | 19 | - | - |
| surrejoinder | 20 | (law) a pleading by the plaintiff in reply to the defendant's rejoinder | - |
| synchroniser | 20 | an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines) | - |
| thereinafter | 18 | - | - |
| throughither | 22 | - | - |
| throughother | 22 | - | - |
| tenderometer | 15 | - | - |
| tellurometer | 14 | - | - |
| theologaster | 16 | - | - |
| testificator | 17 | - | - |
| transshipper | 19 | - | - |
| transplanter | 14 | a gardener who moves plants to new locations | - |
| trigonometer | 15 | - | - |
| trimolecular | 16 | - | - |
| tranquiliser | 21 | - | - |
| trailbreaker | 18 | - | - |
| troposcatter | 16 | - | - |
| trocheameter | 19 | - | - |
| turbidimeter | 17 | - | - |
| psychrometer | 24 | a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air | - |
| qualificator | 26 | - | - |
| proselytiser | 17 | - | - |
| proselytizer | 26 | - | - |
| pseudoscalar | 17 | - | - |
| pseudovector | 20 | - | - |
| pseudomartyr | 20 | - | - |
| receptacular | 18 | - | - |
| reciprocator | 18 | - | - |
| recriminator | 16 | - | - |
| reconnoitrer | 14 | - | - |
| radiographer | 19 | a person who makes radiographs | - |
| quarrymaster | 26 | - | - |
| rationalizer | 21 | - | - |
| rationaliser | 12 | - | - |
| ratiocinator | 14 | someone who reasons logically | - |
| unfriendlier | 16 | - | - |
| unimolecular | 16 | - | - |
| underbuilder | 16 | - | - |
| underskinker | 21 | - | - |
| underpropper | 19 | - | - |
| understander | 14 | - | - |
| uranographer | 18 | - | - |
| viscosimeter | 19 | a measuring instrument for measuring viscosity | - |
| visceromotor | 19 | - | - |
| viticulturer | 17 | - | - |
| videographer | 22 | - | - |
| waistcoateer | 17 | - | - |
| versificator | 20 | - | - |
| veggieburger | 20 | - | - |
| wunderkinder | 21 | - | - |
| woolgatherer | 19 | someone who indulges in idle or absentminded daydreaming | - |
| wondermonger | 19 | - | - |
| yellowhammer | 25 | European bunting the male being bright yellow | - |
| zincographer | 29 | - | - |
| weisenheimer | 20 | an upstart who makes conceited, sardonic, insolent comments | - |
| waterproofer | 20 | - | - |
| whencesoever | 23 | - | - |
| methoxychlor | 32 | - | - |
| methanometer | 19 | - | - |
| middlebuster | 18 | - | - |
| microtubular | 18 | - | - |
| micromanager | 19 | - | - |
| micrographer | 22 | - | - |
| memorializer | 25 | - | - |
| memorialiser | 16 | - | - |
| merchandiser | 20 | a businessperson engaged in retail trade | - |
| metacomputer | 20 | - | - |
| merchandizer | 29 | - | - |
| mollycoddler | 21 | someone who pampers or spoils by excessive indulgence | - |
| moneychanger | 23 | - | - |
| miscegenator | 17 | - | - |
| minicomputer | 20 | a digital computer of medium size | - |
| misconceiver | 21 | - | - |
| myofibrillar | 22 | - | - |
| nationaliser | 12 | - | - |
| neandertaler | 13 | - | - |
| nationalizer | 21 | - | - |
| necrographer | 20 | - | - |
| mythologizer | 30 | - | - |
| mythographer | 26 | - | - |
| mythologiser | 21 | - | - |
| multilobular | 16 | - | - |
| multilocular | 16 | - | - |
| multinuclear | 16 | - | - |
| mouthbreeder | 20 | any of various fishes that carry their eggs and their young in their mouths | - |
| mouthbrooder | 20 | - | - |
| muckspreader | 23 | - | - |
| multiangular | 15 | - | - |
| noncollinear | 14 | - | - |
| noncharacter | 19 | - | - |
| noncollector | 16 | - | - |
| nonconductor | 17 | a material such as glass or porcelain with negligible electrical or thermal conductivity | - |
| noncrossover | 17 | - | - |
| nonconformer | 19 | - | - |
| nonlandowner | 16 | - | - |
| nonmolecular | 16 | - | - |
| nephelometer | 19 | - | - |
| needleworker | 20 | someone who does work (as sewing or embroidery) with a needle | - |
| nightclubber | 22 | - | - |
| nocireceptor | 18 | - | - |
| officeholder | 24 | someone who is appointed or elected to an office and who holds a position of trust | - |
| olfactometer | 19 | - | - |
| oneiromancer | 16 | someone who divines through the interpretation of dreams | - |
| nonperformer | 19 | - | - |
| nonresponder | 15 | - | - |
| overengineer | 16 | - | - |
| overfamiliar | 20 | taking undue liberties | young women disliked the overfamiliar tone he took with them |
| orchestrater | 17 | - | - |
| orthographer | 21 | - | - |
