10-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.
- officially 21
- operations 12
- originally 14
- occupation 16
- outrageous 11
- obligation 13
- opposition 14
- optimistic 16
- organizing 21
- occasional 14
- oppression 14
- overweight 20
- overlooked 18
- originated 12
- occurrence 16
- overturned 14
- orchestral 15
- ordinarily 14
- overloaded 15
- oppressive 17
- obligatory 16
- overcoming 18
- obituaries 12
- organising 12
- overheated 17
- obliterate 12
- overseeing 14
- overpriced 18
- ordination 11
- obstructed 15
- omnipotent 14
- overriding 15
- oncologist 13
- overtaking 18
- ornamental 12
- outlandish 14
- omniscient 14
- orthopedic 18
- ostensibly 15
- outpatient 12
- overcharge 19
- overacting 16
- oftentimes 15
- overactive 18
- overstated 14
- overstayed 17
- observance 17
- originator 11
- obsequious 21
- overshadow 20
- obstetrics 14
- occidental 15
- outclassed 13
- orientated 11
- outpouring 13
- obediently 16
- overeating 14
- overlapped 18
- outfielder 14
- overvalued 17
- overridden 15
- oxygenated 22
- otherworld 17
- oscillator 12
- overlaying 17
- outgrowing 15
- oesophagus 16
- overburden 16
- observable 17
- outfitting 14
- overground 15
- oceanfront 15
- overruling 14
- officiated 19
- overexpose 22
- overdosing 15
- overpraise 15
- ovipositor 15
- odontology 15
- offsetting 17
- outwitting 14
- oppositely 17
- ostracised 13
- obligingly 17
- outshining 14
- octahedron 16
- outperform 17
- officiator 18
- outselling 11
- overrating 14
- oropharynx 25
- orphanhood 19
- oakenshaws 20
- oakinesses 14
- oasthouses 13
- obbligatos 15
- obduracies 15
- obdurating 14
- obediences 15
- obeisances 14
- obeisantly 15
- obeliscoid 15
- obeliskoid 17
- obesogenic 15
- obfuscated 18
- obfuscates 17
- obituarist 12
- objections 21
- objectives 24
- objectless 21
- objuration 19
- objurgated 21
- objurgates 20
- objurgator 20
- oblateness 12
- oblational 12
- obligating 14
- obligators 13
- obligement 15
- obnubilate 14
- obreptions 14
- obscurants 14
- obsecrated 15
- observably 20
- observancy 20
- observants 15
- observator 15
- obsessedly 16
- obsessions 12
- obsessives 15
- obsidional 13
- obsignated 14
- obsignates 13
- obsolesced 15
- obsolesces 14
- obsoletely 15
- obsoleting 13
- obsoletion 12
- obsoletism 14
- obstructer 14
- obtainable 14
- obtainment 14
- obtempered 17
- obtentions 12
- obtrudings 14
- obtruncate 14
- obtrusions 12
- obtundents 13
- obturation 12
- obturators 12
- obtuseness 12
- obtusities 12
- obumbrated 17
- obumbrates 16
- obventions 15
- obversions 15
- obviations 15
- obvolution 15
- obvolutive 18
- occasioned 15
- occasioner 14
- occipitals 16
- occlusions 14
- occlusives 17
- occultisms 16
- occultists 14
- occultness 14
- occupances 18
- occupating 17
- occupative 19
- occurrents 14
- oceanarium 14
- oceangoing 14
- oceanology 16
- ocellation 12
- ochlocracy 22
- ochlocrats 17
- ochraceous 17
- octachords 18
- octahedral 16
- octamerous 14
- octameters 14
- octandrian 13
- octandrous 13
- octangular 13
- octaploids 15
- octaploidy 18
- octapodies 15
- octarchies 17
- octastichs 17
- ozonolysis 22
- octonaries 12
- octonarius 12
- octoploids 15
- octopodans 15
- octopushes 17
- octostyles 15
- octothorpe 17
- octothorps 17
- ocularists 12
- oculomotor 14
- odalisques 20
- oddsmakers 18
- odiousness 11
- odometries 13
- odonatists 11
- odontalgia 12
- odontalgic 14
- odontocete 13
- odontogeny 15
- odontomata 13
- odorimetry 16
- odoriphore 16
- oecologies 13
- oecologist 13
- oedematose 13
- oedematous 13
- oedometers 13
- oenologies 11
- oenologist 11
- oenomanias 12
- oenometers 12
- oenophiles 15
- oenophilic 17
- oenotheras 13
- oestradiol 11
- oestrogens 11
- offenceful 21
- offendedly 21
- offendress 17
- offensives 19
- officemate 20
- officering 19
- officialty 21
- officiants 18
- officiates 18
- officinals 18
- offishness 19
- offprinted 19
- offsaddled 19
- offsaddles 18
- offseasons 16
- offsetable 18
- offshoring 20
- offsprings 19
- oganessons 11
- oilinesses 10
- oinologies 11
- oldfangled 16
- oleaginous 11
- olecranons 12
- oleiferous 13
- oleographs 16
- oleography 19
- oleophilic 17
- oleoresins 10
- oleraceous 12
- olfactible 17
- olfactions 15
- oligaemias 13
- oligarchal 16
- oligarchic 18
- oligoclase 13
- oligogenes 12
- oligomeric 15
- oligophagy 20
- oligopsony 16
- oligureses 11
- oliguresis 11
- oliguretic 13
- olinguitos 11
- olivaceous 15
- olivenites 13
- olivewoods 17
- olivinitic 15
- ologoaning 12
- ololiuquis 19
- ombrometer 16
- ombrophile 19
- ombrophils 19
- ombrophobe 21
- omeprazole 23
- omittances 14
- ommatidial 15
- ommatidium 17
- omnibusses 14
- omniferous 15
- omnificent 17
- omnigenous 13
- omniparity 17
- omniparous 14
- omniranges 13
- omnisexual 19
- omnivories 15
- omnivorous 15
- omophagias 18
- omophagies 18
- omophagous 18
- onshorings 14
- ontologist 11
- oogamously 16
- oojamaflip 24
- oompahpahs 22
- oophoritic 17
- oophoritis 15
- oozinesses 19
- opacifiers 17
- opalescing 15
- opaqueness 21
- openhanded 17
- opennesses 12
- operagoers 13
- operagoing 14
- operatised 13
- operatises 12
- operatives 15
- operatized 22
- operatizes 21
- operculars 14
- operculate 14
- operculums 16
- operettist 12
- ophicleide 18
- ophidiaria 16
- ophiolater 15
- ophiolatry 18
- ophiolites 15
- ophiolitic 17
- ophiologic 18
- ophiomorph 22
- ophiuroids 16
- ophthalmia 20
- ophthalmic 22
- opinicuses 14
- opinionate 12
- opinionist 12
- opisometer 14
- opobalsams 16
- opopanaxes 21
- opotherapy 20
- oppilating 15
- oppilation 14
- oppilative 17
- opposeless 14
- opposingly 18
- oppositive 17
- oppressing 15
- oppressors 14
- opprobrium 18
- oppugnancy 20
- oppugnants 15
- opsiometer 14
- opsomaniac 16
- opsomanias 14
- opsonified 16
- opsonifies 15
- opsonising 13
- opsonizing 22
- optatively 18
- optimalise 14
- optimality 17
- optimalize 23
- optimisers 14
- optimising 15
- optimizers 23
- optimizing 24
- optionally 15
- optologies 13
- optologist 13
- optometers 14
- optometric 16
- optophones 17
- opulencies 14
- oracularly 15
- orangeades 12
- orangeries 11
- orangewood 15
- orangutans 11
- oratorians 10
- oratorical 12
- oratresses 10
- orbiculate 14
- orcharding 17
- orchardist 16
- orchardman 18
- orchardmen 18
- orchestics 17
- orchestras 15
- orchestric 17
- orchideous 16
- orchidists 16
- orchidlike 20
- orchitises 15
- ordainable 13
- ordainment 13
- ordinaires 11
- ordinarier 11
- ordinaries 11
- ordinately 14
- ordinating 12
- ordonnance 13
- oreography 19
- oreologies 11
- oreologist 11
- organelles 11
- organicism 15
- organicist 13
- organicity 16
- organisers 11
- organismal 13
- organismic 15
- organities 11
- organizers 20
- organogeny 15
- organogram 14
- organology 15
- organosols 11
- organzines 20
- oricalches 17
- orientally 13
- orientates 10
- orientator 10
- orienteers 10
- oriflammes 17
- originates 11
- orinasally 13
- orismology 16
- ornamented 13
- ornamenter 12
- ornateness 10
- orneriness 10
- ornithines 13
- ornithopod 16
- ornithoses 13
- ornithosis 13
- orogeneses 11
- orogenesis 11
- orogenetic 13
- orographer 16
- orographic 18
- orological 13
- orologists 11
- orotundity 14
- orphanages 16
- orphanisms 17
- orpharions 15
- orpheoreon 15
- orphically 20
- orrisroots 10
- ortaniques 19
- orthoboric 17
- orthocaine 15
- orthoclase 15
- orthodoxes 21
- orthodoxly 24
- orthodromy 19
- orthoepies 15
- orthoepist 15
- orthogenic 16
- orthogonal 14
- orthograde 15
- orthograph 19
- orthopaedy 19
- orthopedia 16
- orthophyre 21
- orthopnoea 15
- orthopraxy 25
- orthoprism 17
- orthoptera 15
- orthopters 15
- orthoptics 17
- orthoptist 15
- orthorexia 20
- orthoscope 17
- orthotists 13
- orthotones 13
- orthotonic 15
- orthotopic 17
- orthotropy 18
- oryctology 19
- oscillated 13
- oscillates 12
- oscitances 14
- oscitantly 15
- oscitating 13
- oscitation 12
- osculating 13
- osculation 12
- osculatory 15
- osmeterium 14
- osmidroses 13
- osmidrosis 13
- osmiridium 15
- osmolality 15
- osmolarity 15
- osmometers 14
- osmometric 16
- osmundines 13
- ossiferous 13
- ossifragas 14
