13-letter words starting with O
Embark on a linguistic journey with words that begin with the letter O. This section showcases how O at the start shapes the identity and sound of various words. From commonly used terms to rare finds, explore the diverse range of words that start with O, enriching your vocabulary and appreciation for language.
| Word | Points | Definition | Sentence example |
|---|---|---|---|
| overconfident | 22 | marked by excessive confidence | so overconfident and impudent as to speak to the queen |
| overestimated | 19 | - | - |
| opportunistic | 19 | taking immediate advantage, often unethically, of any circumstance of possible benefit | - |
| overqualified | 29 | - | - |
| ornithologist | 17 | a zoologist who studies birds | - |
| orchestrating | 19 | - | - |
| objectionable | 26 | liable to objection or debate; used of something one might take exception to | found the politician's views objectionable |
| oceanographic | 23 | - | - |
| oceanographer | 21 | a scientist who studies physical and biological aspects of the seas | - |
| oversensitive | 19 | unduly sensitive or thin-skinned | - |
| overdramatize | 28 | present in an overly dramatic manner | - |
| overpopulated | 21 | - | - |
| overstatement | 18 | making to seem more important than it really is | - |
| observational | 18 | relying on observation or experiment | - |
| orchestration | 18 | the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | - |
| overabundance | 21 | a quantity that is more than what is appropriate | four-year-olds have an overabundance of energy |
| ornamentation | 15 | something used to beautify | - |
| overemotional | 18 | excessively or abnormally emotional | - |
| obsessiveness | 18 | extreme compulsiveness | - |
| ophthalmology | 27 | the branch of medicine concerned with the eye and its diseases | - |
| osteomyelitis | 18 | an inflammation of bone and bone marrow (usually caused by bacterial infection) | - |
| outstandingly | 18 | in an outstanding manner or to an outstanding degree | she was outstandingly successful in her profession |
| overindulging | 19 | - | - |
| objectiveness | 27 | judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | - |
| obnoxiousness | 22 | the quality of being hateful | - |
| overattentive | 19 | - | - |
| objectionably | 29 | in an obnoxious manner | - |
| objectivating | 28 | - | - |
| objectivation | 27 | - | - |
| objectivising | 28 | - | - |
| objectivistic | 29 | - | - |
| objectivities | 27 | - | - |
| objectivizing | 37 | - | - |
| obliquenesses | 24 | - | - |
| obliterations | 15 | - | - |
| obliviousness | 18 | total forgetfulness | - |
| obliviscences | 22 | - | - |
| obmutescences | 21 | - | - |
| obnubilations | 17 | - | - |
| obscenenesses | 17 | - | - |
| obscurantisms | 19 | - | - |
| obscurantists | 17 | - | - |
| obscurenesses | 17 | - | - |
| observability | 23 | - | - |
| observatories | 18 | - | - |
| obsessionally | 18 | in a compulsive manner | - |
| obsessionists | 15 | - | - |
| obsolescences | 19 | - | - |
| obsolescently | 20 | - | - |
| obstetrically | 20 | - | - |
| obstetricians | 17 | - | - |
| obstinateness | 15 | - | - |
| obstreperated | 18 | - | - |
| obstreperates | 17 | - | - |
| obstructingly | 21 | - | - |
| obstructional | 17 | - | - |
| obstructively | 23 | in an obstructive manner | he acted very obstructively when we tried to carry out our project |
| obtainability | 20 | - | - |
| obtemperating | 20 | - | - |
| obtrusiveness | 18 | an unwelcome conspicuousness | - |
| obviousnesses | 18 | - | - |
| occasionalism | 19 | - | - |
| occasionalist | 17 | - | - |
| occasionality | 20 | - | - |
| occidentalise | 18 | make western in character | - |
| occidentalism | 20 | the quality or customs or mannerisms characteristic of Western civilizations | - |
| occidentalist | 18 | - | - |
| occidentalize | 27 | make western in character | - |
| occlusiveness | 20 | - | - |
| oceanological | 18 | - | - |
| oceanologists | 16 | - | - |
| ochlocratical | 22 | - | - |
| ochlophobiacs | 27 | - | - |
| octingenaries | 16 | - | - |
| octocentenary | 20 | - | - |
| octodecillion | 18 | - | - |
| octogenarians | 16 | - | - |
| octosyllabics | 22 | - | - |
| octosyllables | 20 | - | - |
| odonatologies | 15 | - | - |
| odonatologist | 15 | - | - |
| odontoblastic | 18 | - | - |
| odontoglossum | 17 | any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
| odontological | 17 | - | - |
| odontologists | 15 | - | - |
| odontophobias | 21 | - | - |
| odontophorans | 19 | - | - |
| odontophorous | 19 | - | - |
| odontornithes | 17 | - | - |
| odoriferously | 20 | - | - |
| odorousnesses | 14 | - | - |
| oecologically | 21 | - | - |
| oecumenically | 22 | - | - |
| offensiveness | 22 | the quality of being offensive | - |
| offhandedness | 24 | - | - |
| officeholders | 25 | - | - |
| officialities | 21 | - | - |
| officiousness | 21 | aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation | - |
| oleandomycins | 21 | - | - |
| oleomargarine | 16 | a spread made chiefly from vegetable oils and used as a substitute for butter | - |
| oleomargarins | 16 | - | - |
| olericultures | 15 | - | - |
| olfactologies | 19 | - | - |
| olfactologist | 19 | - | - |
| olfactometers | 20 | - | - |
| oligopeptides | 19 | - | - |
| oligopolistic | 18 | - | - |
| oligospermias | 18 | - | - |
| oligotrophies | 19 | - | - |
| ombudsmanship | 25 | - | - |
| ombudspersons | 20 | - | - |
| ominousnesses | 15 | - | - |
| ommatophorous | 22 | - | - |
| omnicompetent | 21 | - | - |
| omnifariously | 21 | - | - |
| omniformities | 20 | - | - |
| omnipotencies | 19 | - | - |
| omnipresences | 19 | - | - |
| omnisexuality | 25 | - | - |
| omoplatoscopy | 24 | - | - |
| oneirocritics | 17 | - | - |
| oneiromancers | 17 | - | - |
| oneiromancies | 17 | - | - |
| oneiroscopies | 17 | - | - |
| oneiroscopist | 17 | - | - |
| onerousnesses | 13 | - | - |
| ongoingnesses | 15 | - | - |
| onomastically | 20 | - | - |
| onomasticians | 17 | - | - |
| onomatologies | 16 | - | - |
| onomatologist | 16 | - | - |
| onomatopoeias | 17 | - | - |
| onomatopoeses | 17 | - | - |
| onomatopoesis | 17 | - | - |
| onomatopoetic | 19 | (of words) formed in imitation of a natural sound | it was independently developed in more than one place as an onomatopoetic term |
| ontogenically | 19 | - | - |
| ontologically | 19 | - | - |
| onychomancies | 25 | - | - |
| onychophagies | 27 | - | - |
| onychophagist | 27 | - | - |
| onychophorans | 26 | - | - |
| openabilities | 17 | - | - |
| openheartedly | 22 | - | - |
| openmouthedly | 24 | - | - |
| operabilities | 17 | - | - |
| operationally | 18 | in respect to operation | reported the machine operationally satisfactory |
| operationisms | 17 | - | - |
| operationists | 15 | - | - |
| operativeness | 18 | - | - |
| operativities | 18 | - | - |
| operosenesses | 15 | - | - |
| ophiomorphous | 25 | - | - |
| ophiophilists | 23 | - | - |
| opinionatedly | 19 | - | - |
| opisthobranch | 25 | - | - |
| opisthographs | 24 | - | - |
| opisthography | 27 | - | - |
| opisthosomata | 20 | - | - |
| oppignerating | 19 | - | - |
| oppigneration | 18 | - | - |
| oppignorating | 19 | - | - |
| oppignoration | 18 | - | - |
| opportuneness | 17 | timely convenience | - |
| opportunities | 17 | - | - |
| oppositionist | 17 | - | - |
| opprobriously | 22 | - | - |
| opsonisations | 15 | - | - |
| opsonizations | 24 | - | - |
| optimisations | 17 | - | - |
| optimizations | 26 | - | - |
| optionalities | 15 | - | - |
| oracularities | 15 | - | - |
| oraculousness | 15 | - | - |
| orchesography | 27 | - | - |
| orchestralist | 18 | - | - |
| orchestraters | 18 | - | - |
| orchestrators | 18 | - | - |
| orchidologies | 20 | - | - |
| orchidologist | 20 | - | - |
| orchidomaniac | 23 | - | - |
| orchidomanias | 21 | - | - |
| orchiectomies | 22 | - | - |
| orderlinesses | 14 | - | - |
| oreographical | 21 | - | - |
| organisations | 14 | - | - |
| organizations | 23 | - | - |
| organogeneses | 15 | - | - |
| organogenesis | 15 | - | - |
| organogenetic | 17 | - | - |
| organographic | 22 | - | - |
| organological | 17 | - | - |
| organologists | 15 | - | - |
| organotherapy | 22 | - | - |
| orgiastically | 19 | - | - |
| orientalising | 14 | - | - |
| orientalities | 13 | - | - |
| orientalizing | 23 | - | - |
| orientational | 13 | - | - |
| orienteerings | 14 | - | - |
| originalities | 14 | - | - |
| originatively | 20 | - | - |
| orismological | 18 | - | - |
| ornithichnite | 21 | - | - |
| ornithischian | 21 | herbivorous dinosaur with a pelvis like that of a bird | - |
| ornithogalums | 19 | - | - |
| ornithologies | 17 | - | - |
| ornithomantic | 20 | - | - |
| ornithomorphs | 23 | - | - |
| ornithophobia | 23 | - | - |
| oropharyngeal | 22 | of or relating to or located near the oropharynx | - |
| orthocephalic | 25 | - | - |
| orthodiagonal | 18 | - | - |
| orthodontists | 17 | - | - |
| orthoepically | 23 | - | - |
| orthognathies | 20 | - | - |
| orthognathism | 22 | - | - |
| orthognathous | 20 | - | - |
| orthogonalise | 17 | - | - |
| orthogonality | 20 | the relation of opposition between things at right angles | - |
| orthogonalize | 26 | - | - |
| orthographers | 22 | - | - |
| orthographies | 22 | - | - |
| orthographist | 22 | - | - |
| orthohydrogen | 24 | - | - |
| orthopaedical | 21 | - | - |
| orthopaedists | 19 | - | - |
| orthopinakoid | 23 | - | - |
| orthopterists | 18 | - | - |
| orthopteroids | 19 | - | - |
| orthopyroxene | 28 | - | - |
| orthosilicate | 18 | - | - |
| orthostichies | 21 | - | - |
| orthostichous | 21 | - | - |
| orthotropisms | 20 | - | - |
| orthotungstic | 19 | - | - |
| oscillational | 15 | - | - |
| oscillographs | 21 | - | - |
| oscillography | 24 | - | - |
| oscilloscopes | 19 | - | - |
| oscilloscopic | 21 | - | - |
| ossifications | 18 | - | - |
| osteichthyans | 24 | - | - |
| ostensibility | 18 | - | - |
| osteofibroses | 18 | - | - |
| osteofibrosis | 18 | - | - |
| osteographies | 19 | - | - |
| osteomalacial | 17 | - | - |
| osteomalacias | 17 | - | - |
| osteopathists | 18 | - | - |
| osteopetroses | 15 | - | - |
| osteopetrosis | 15 | an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | - |
| osteoplasties | 15 | - | - |
| osteosarcomas | 17 | - | - |
| ostreiculture | 15 | - | - |
| ostreophagies | 19 | - | - |
| ostreophagous | 19 | - | - |
| otherworldish | 23 | - | - |
| ototoxicities | 22 | - | - |
| outbargaining | 17 | - | - |
| outblustering | 16 | - | - |
| outdelivering | 18 | - | - |
| outdistancing | 17 | - | - |
| outdoorswoman | 19 | a woman who spends time outdoors (e.g., hunting and fishing) | - |
| outdoorswomen | 19 | - | - |
| outgeneraling | 15 | - | - |
| outgeneralled | 15 | - | - |
| outglittering | 15 | - | - |
| outintriguing | 15 | - | - |
| outmaneuvered | 19 | - | - |
| outmanipulate | 17 | - | - |
| outmanoeuvred | 19 | - | - |
| outmanoeuvres | 18 | - | - |
| outorganising | 15 | - | - |
| outorganizing | 24 | - | - |
| outpassioning | 16 | - | - |
| outperforming | 21 | - | - |
| outplacements | 19 | - | - |
| outpoliticked | 22 | - | - |
| outpopulating | 18 | - | - |
| outrebounding | 17 | - | - |
| outrecuidance | 18 | - | - |
| outreproduced | 19 | - | - |
| outreproduces | 18 | - | - |
| outsettlement | 15 | - | - |
| outspokenness | 19 | the trait of being blunt and outspoken | - |
| outstretching | 19 | - | - |
| outsweetening | 17 | - | - |
| outtravelling | 17 | - | - |
| outvillaining | 17 | - | - |
| outwardnesses | 17 | - | - |
| ovariectomies | 20 | - | - |
| ovariotomists | 18 | - | - |
| overabounding | 20 | - | - |
| overabstracts | 20 | - | - |
| overachievers | 24 | - | - |
| overachieving | 25 | - | - |
| overadjusting | 25 | - | - |
| overadvertise | 20 | - | - |
| overadvertize | 29 | - | - |
| overalertness | 16 | - | - |
| overambitious | 20 | excessively ambitious | - |
| overamplified | 24 | - | - |
| overanalysing | 20 | - | - |
| overanalyzing | 29 | - | - |
| overanxieties | 23 | - | - |
| overarranging | 18 | - | - |
| overasserting | 17 | - | - |
| overassertion | 16 | - | - |
| overassertive | 19 | - | - |
| overassessing | 17 | - | - |
| overattention | 16 | - | - |
| overbalancing | 21 | - | - |
| overbearingly | 22 | in an overbearing manner | - |
| overbejeweled | 29 | - | - |
| overbleaching | 24 | - | - |
| overborrowing | 22 | - | - |
| overbreathing | 22 | - | - |
| overburdening | 20 | - | - |
| overburthened | 22 | - | - |
| overcanopying | 24 | - | - |
| overcarefully | 24 | - | - |
| overcautioned | 19 | - | - |
| overchargings | 23 | - | - |
| overcivilised | 22 | - | - |
| overcivilized | 31 | - | - |
| overclockings | 25 | - | - |
| overcolouring | 19 | - | - |
| overcommitted | 23 | - | - |
| overconcerned | 21 | - | - |
| overconscious | 20 | - | - |
| overconstruct | 20 | - | - |
| overconsuming | 21 | - | - |
| overcorrected | 21 | - | - |
| overcrammings | 23 | - | - |
| overcredulity | 22 | too much credulity | - |
| overcredulous | 19 | too credulous for your own good | - |
| overcrowdings | 23 | - | - |
| overdecorated | 20 | - | - |
| overdecorates | 19 | - | - |
| overdeepening | 20 | - | - |
| overdemanding | 21 | - | - |
| overdependent | 20 | - | - |
| overdesigning | 19 | - | - |
| overdeveloped | 23 | - | - |
| overdeviating | 21 | - | - |
| overdiagnosed | 19 | - | - |
| overdiagnoses | 18 | - | - |
| overdiagnosis | 18 | - | - |
| overdirecting | 20 | - | - |
| overdiscounts | 19 | - | - |
| overdiversity | 23 | - | - |
| overdocuments | 21 | - | - |
| overdominance | 21 | - | - |
| overdramatics | 21 | - | - |
| overdramatise | 19 | present in an overly dramatic manner | - |
| overeagerness | 17 | - | - |
| overearnestly | 19 | - | - |
| overeducating | 20 | - | - |
| overeducation | 19 | - | - |
| overelaborate | 18 | - | - |
| overembellish | 23 | - | - |
| overemphasise | 23 | place special or excessive emphasis on | - |
| overemphasize | 32 | place special or excessive emphasis on | I cannot overemphasize the importance of this book |
| overenamoured | 19 | - | - |
| overencourage | 19 | - | - |
| overenergetic | 19 | - | - |
| overengineers | 17 | - | - |
| overequipping | 30 | - | - |
| overestimates | 18 | - | - |
| overevaluated | 20 | - | - |
| overevaluates | 19 | - | - |
| overexcitable | 27 | - | - |
| overexcitedly | 29 | - | - |
| overexercised | 26 | - | - |
| overexercises | 25 | - | - |
| overexertions | 23 | - | - |
| overexpanding | 27 | - | - |
| overexpansion | 25 | - | - |
| overexplained | 26 | - | - |
| overexploited | 26 | - | - |
| overexposures | 25 | - | - |
| overextending | 25 | - | - |
| overextension | 23 | - | - |
| overexuberant | 25 | - | - |
| overfatiguing | 21 | - | - |
| overfavouring | 23 | - | - |
| overfertilise | 19 | - | - |
| overfertilize | 28 | - | - |
| overflowingly | 26 | - | - |
| overfocussing | 22 | - | - |
| overfulfilled | 23 | - | - |
| overfulnesses | 19 | - | - |
| overglamorise | 19 | - | - |
| overglamorize | 28 | - | - |
| overgoverning | 21 | - | - |
| overgreediest | 18 | - | - |
| overharvested | 23 | - | - |
| overhastiness | 19 | - | - |
| overhonouring | 20 | - | - |
| overidealised | 18 | - | - |
| overidealises | 17 | - | - |
| overidealized | 27 | - | - |
| overidealizes | 26 | - | - |
| overimpressed | 21 | - | - |
| overimpresses | 20 | - | - |
| overindulgent | 18 | excessively indulgent | - |
| overinflating | 20 | - | - |
| overinflation | 19 | - | - |
| overinforming | 22 | - | - |
| overingenious | 17 | - | - |
| overingenuity | 20 | - | - |
| overinsistent | 16 | - | - |
| overinsurance | 18 | - | - |
| overintensely | 19 | - | - |
| overintensity | 19 | - | - |
| overinterpret | 18 | - | - |
| overinvesting | 20 | - | - |
| overissuances | 18 | - | - |
| overlabouring | 19 | - | - |
| overlaunching | 22 | - | - |
| overlavishing | 23 | - | - |
| overleavening | 20 | - | - |
| overlengthens | 20 | - | - |
| overleveraged | 21 | - | - |
| overlordships | 22 | - | - |
| overmastering | 19 | - | - |
| overmeasuring | 19 | - | - |
| overmedicated | 22 | - | - |
| overmedicates | 21 | - | - |
| overmightiest | 22 | - | - |
| overmodesties | 19 | - | - |
| overmodulated | 20 | - | - |
| overmultitude | 19 | - | - |
| overnourished | 20 | - | - |
| overnourishes | 19 | - | - |
| overnutrition | 16 | - | - |
| overoperating | 19 | - | - |
| overoptimisms | 22 | - | - |
| overoptimists | 20 | - | - |
| overorganised | 18 | - | - |
| overorganises | 17 | - | - |
| overorganized | 27 | - | - |
| overorganizes | 26 | - | - |
| overornaments | 18 | - | - |
| overpackaging | 26 | - | - |
| overpedalling | 20 | - | - |
| overpersuaded | 20 | - | - |
| overpersuades | 19 | - | - |
| overpicturing | 21 | - | - |
| overplannings | 19 | - | - |
| overplottings | 19 | - | - |
| overpopulates | 20 | - | - |
| overpredicted | 22 | - | - |
| overpreparing | 21 | - | - |
| overprescribe | 22 | - | - |
| overpressured | 19 | - | - |
| overpressures | 18 | - | - |
| overprocessed | 21 | - | - |
| overprocesses | 20 | - | - |
| overproducing | 22 | - | - |
| overprogramed | 22 | - | - |
| overpromising | 21 | - | - |
| overpromoting | 21 | - | - |
| overprotected | 21 | - | - |
| overreactions | 18 | - | - |
| overreckoning | 23 | a calculation that results in an estimate that is too high | - |
| overregulated | 18 | - | - |
| overregulates | 17 | - | - |
| overreliances | 18 | - | - |
| overreporting | 19 | - | - |
| overresponded | 20 | - | - |
| oversaturated | 17 | - | - |
| oversaturates | 16 | - | - |
| overscheduled | 23 | - | - |
| overschedules | 22 | - | - |
| oversecreting | 19 | - | - |
| oversecretion | 18 | - | - |
| overseriously | 19 | - | - |
| overservicing | 22 | - | - |
| overshadowing | 24 | - | - |
| overshowering | 23 | - | - |
| overslaughing | 21 | - | - |
| overspeculate | 20 | - | - |
| overspendings | 20 | - | - |
| overspreading | 20 | - | - |
| overstability | 21 | - | - |
| overstaffings | 23 | - | - |
| overstimulate | 18 | - | - |
| overstraining | 17 | - | - |
| overstressing | 17 | - | - |
| overstretched | 22 | - | - |
| overstretches | 21 | - | - |
| overstructure | 18 | - | - |
| oversubscribe | 22 | - | - |
| oversupplying | 24 | - | - |
| oversweetened | 20 | - | - |
| oversweetness | 19 | - | - |
| overtalkative | 23 | - | - |
| overtaxations | 23 | - | - |
| overthwarting | 23 | - | - |
