There are in total 808 words starting with the letter O and 12 letters in length. Word Length oafishnesses 12 oarsmanships 12 obcompressed 12 obdurateness 12 obedientiary 12 obfuscations 12 objectifying 12 objectivated 12 objectivates 12 objectivised 12 objectivises 12 objectivisms 12 objectivists 12 objectivized 12 objectivizes 12 objectlessly 12 objurgations 12 oblanceolate 12 oblatenesses 12 obligational 12 obligatorily 12 obligingness 12 obliquations 12 obliterating 12 obliteration 12 obliterative 12 obliterators 12 obliviscence 12 obmutescence 12 obnubilating 12 obnubilation 12 obreptitious 12 obscurantism 12 obscurantist 12 obscurations 12 obscurements 12 obsecrations 12 obsequiously 12 observancies 12 observations 12 obsessionist 12 obsignations 12 obsolescence 12 obsoleteness 12 obstetrician 12 obstipations 12 obstreperate 12 obstreperous 12 obstrictions 12 obstropalous 12 obstropulous 12 obstructions 12 obstructives 12 obtemperated 12 obtemperates 12 obtestations 12 obtruncating 12 obtusenesses 12 obumbrations 12 occasionally 12 occidentally 12 occultations 12 occultnesses 12 occupational 12 oceanography 12 oceanologies 12 oceanologist 12 ochlocracies 12 ochlophobiac 12 ochlophobias 12 ochlophobics 12 ochroleucous 12 octahedrally 12 octahedrites 12 octapeptides 12 octaploidies 12 octastichons 12 octastichous 12 octastrophic 12 octillionths 12 octogenarian 12 octogenaries 12 octopetalous 12 octosepalous 12 octostichous 12 octosyllabic 12 octosyllable 12 octuplicates 12 odiousnesses 12 odontoblasts 12 odontogenies 12 odontographs 12 odontography 12 odontologies 12 odontologist 12 odontomatous 12 odontophobia 12 odontophoral 12 odontophoran 12 odontophores 12 odorimetries 12 oenophilists 12 oesophagitis 12 oesophaguses 12 offendresses 12 officeholder 12 officialdoms 12 officialeses 12 officialised 12 officialises 12 officialisms 12 officialized 12 officializes 12 officialties 12 officiations 12 offishnesses 12 offscourings 12 oiltightness 12 olallieberry 12 oleaginously 12 oleandomycin 12 oleochemical 12 oleographies 12 oleomargarin 12 oleoresinous 12 olfactometer 12 olfactometry 12 olfactronics 12 oligarchical 12 oligochaetes 12 oligochromes 12 oligomerised 12 oligomerises 12 oligomerized 12 oligomerizes 12 oligopeptide 12 oligophagies 12 oligophagous 12 oligopolists 12 oligopsonies 12 oligospermia 12 oligotrophic 12 ombrophilous 12 ombrophobous 12 ombrotrophic 12 ombudsperson 12 omissiveness 12 ommatophores 12 omnificences 12 omniparities 12 omnipotences 12 omnipotently 12 omnipresence 12 omnisciences 12 omnisciently 12 omnishambles 12 omnivorously 12 omphaloceles 12 omphalomancy 12 oncogenicity 12 oncornavirus 12 oneirocritic 12 oneirodynias 12 oneirologies 12 oneiromancer 12 oneupmanship 12 onomasiology 12 onomastician 12 onomasticons 12 onomatopoeia 12 onomatopoeic 12 ontologistic 12 onychophoran 12 oophorectomy 12 oophoritises 12 opalescences 12 opalescently 12 opaquenesses 12 opeidoscopes 12 openhandedly 12 operatically 12 operationism 12 operationist 12 operatorless 12 operatorship 12 ophicalcites 12 ophidiariums 12 ophiolatries 12 ophiolatrous 12 ophiological 12 ophiologists 12 ophiomorphic 12 ophiophagous 12 ophiophilist 12 ophthalmists 12 ophthalmitis 12 opinionately 12 opinionating 12 opinionative 12 opinionators 12 opinionising 12 opinionizing 12 opisthodomoi 12 opisthodomos 12 opisthograph 12 opisthosomas 12 opisthotonic 12 opisthotonos 12 opisthotonus 12 opotherapies 12 oppignerated 12 oppignerates 12 oppignorated 12 oppignorates 12 opportunisms 12 opportunists 12 opposability 12 oppositeness 12 oppositional 12 oppressingly 12 oppressively 12 oppugnancies 12 opsonisation 12 opsonization 12 optimalising 12 optimalities 12 optimalizing 12 optimisation 12 optimistical 12 optimization 12 optoacoustic 12 optocouplers 12 optogenetics 12 optometrical 12 optometrists 12 oracularness 12 oratorically 12 orbicularity 12 orchardgrass 12 orchestrally 12 orchestrated 12 orchestrater 12 orchestrates 12 orchestrator 12 orchestrinas 12 orchestrions 12 orchidaceous 12 orchidectomy 12 orchidomania 12 ordinariness 12 orecchiettes 12 oreographies 12 orepearching 12 organicistic 12 organicities 12 organisation 12 organismally 12 organistrums 12 organization 12 organogenies 12 organography 12 organoleptic 12 organologies 12 organologist 12 orgasmically 12 orgastically 12 orichalceous 12 orientalised 12 orientalises 12 orientalisms 12 orientalists 12 orientalized 12 orientalizes 12 orientations 12 orienteering 12 originations 12 orismologies 12 ornamentally 12 ornamentists 12 ornatenesses 12 ornerinesses 12 ornithogalum 12 ornithologic 12 ornithomancy 12 ornithomorph 12 ornithophily 12 ornithopters 12 ornithosaurs 12 ornithoscopy 12 orogenically 12 orographical 12 orologically 12 oromaxillary 12 oropharynges 12 oropharynxes 12 ororotundity 12 orotundities 12 orthoborates 12 orthocenters 12 orthocentres 12 orthocephaly 12 orthoclastic 12 orthocousins 12 orthodontias 12 orthodontics 12 orthodontist 12 orthodromics 12 orthodromies 12 orthoepistic 12 orthogeneses 12 orthogenesis 12 orthogenetic 12 orthognathic 12 orthogonally 12 orthographer 12 orthographic 12 orthomorphic 12 orthonectids 12 orthopaedics 12 orthopaedies 12 orthopaedist 12 orthopedical 12 orthopedists 12 orthopraxies 12 orthopterans 12 orthopterist 12 orthopteroid 12 orthopterous 12 orthorhombic 12 orthosilicic 12 orthotoneses 12 orthotonesis 12 orthotropies 12 orthotropism 12 orthotropous 12 orthovanadic 12 oryctologies 12 oscillations 12 oscillograms 12 oscillograph 12 oscilloscope 12 osculatories 12 osmolalities 12 osmolarities 12 ossification 12 osteichthyan 12 ostentations 12 ostentatious 12 osteoblastic 12 osteoclastic 12 osteodermous 12 osteogeneses 12 osteogenesis 12 osteogenetic 12 osteological 12 osteologists 12 osteomalacia 12 osteomalacic 12 osteopathies 12 osteopathist 12 osteoplastic 12 osteoporoses 12 osteoporosis 12 osteoporotic 12 osteosarcoma 12 osteospermum 12 ostracisable 12 ostracizable 12 ostracoderms 12 ostreophages 12 otherworldly 12 otiosenesses 12 otologically 12 otoscleroses 12 otosclerosis 12 otosclerotic 12 outachieving 12 outbalancing 12 outbargained 12 outblustered 12 outbrazening 12 outbreathing 12 outbreedings 12 outbuildings 12 outcavilling 12 outcompeting 12 outcraftying 12 outcroppings 12 outcrossings 12 outdatedness 12 outdelivered 12 outdesigning 12 outdistanced 12 outdistances 12 outdoorsiest 12 outercourses 12 outfangthief 12 outfightings 12 outgalloping 12 outgeneraled 12 outglittered 12 outgoingness 12 outhumouring 12 outintrigued 12 outintrigues 12 outjockeying 12 outlandishly 12 outlaunching 12 outlustering 12 outmaneuvers 12 outmanoeuvre 12 outmarriages 12 outmastering 12 outmeasuring 12 outmigration 12 outmodedness 12 outnumbering 12 outorganised 12 outorganises 12 outorganized 12 outorganizes 12 outpassioned 12 outperformed 12 outplacement 12 outpoliticks 12 outpopulated 12 outpopulates 12 outpreaching 12 outproducing 12 outpromising 12 outrageously 12 outreasoning 12 outrebounded 12 outreckoning 12 outreddening 12 outreproduce 12 outrivalling 12 outsavouring 12 outscreaming 12 outsiderness 12 outsourcings 12 outsparkling 12 outspreading 12 outspringing 12 outsprinting 12 outstraining 12 outstretched 12 outstretches 12 outstripping 12 outsweetened 12 outthrobbing 12 outthrusting 12 outtraveling 12 outtravelled 12 outvillained 12 outwrestling 12 ovariotomies 12 ovariotomist 12 overabounded 12 overabstract 12 overabundant 12 overachieved 12 overachiever 12 overachieves 12 overactivity 12 overambition 12 overanalysed 12 overanalyses 12 overanalysis 12 overanalyzed 12 overanalyzes 12 overarousals 12 overarranged 12 overarranges 12 overasserted 12 overbalanced 12 overbalances 12 overbettings 12 overbiddings 12 overblankets 12 overbleached 12 overbleaches 12 overboldness 12 overbookings 12 overborrowed 12 overbounding 12 overbreathed 12 overbreathes 12 overbreeding 12 overbridging 12 overbriefing 12 overbrimming 12 overbrowsing 12 overbuilding 12 overburdened 12 overburthens 12 overcanopied 12 overcanopies 12 overcapacity 12 overcarrying 12 overcastings 12 overcatching 12 overcautions 12 overcautious 12 overcharging 12 overchilling 12 overclaiming 12 overclassify 12 overcleaning 12 overclearing 12 overclockers 12 overclocking 12 overclouding 12 overclubbing 12 overcoaching 12 overcoatings 12 overcoloring 12 overcoloured 12 overcompress 12 overconcerns 12 overconsumed 12 overconsumes 12 overcontrols 12 overcorrects 12 overcounting 12 overcovering 12 overcramming 12 overcritical 12 overcropping 12 overcrowding 12 overcuttings 12 overdaringly 12 overdecorate 12 overdelicacy 12 overdelicate 12 overdesigned 12 overdetailed 12 overdevelops 12 overdeviated 12 overdeviates 12 overdiagnose 12 overdirected 12 overdiscount 12 overdocument 12 overdominant 12 overdramatic 12 overdraughts 12 overdressing 12 overdrinking 12 overeducated 12 overeducates 12 overeffusive 12 overemphases 12 overemphasis 12 overemphatic 12 overenamored 12 overengineer 12 overenrolled 12 overequipped 12 overestimate 12 overexacting 12 overexciting 12 overexercise 12 overexerting 12 overexertion 12 overexpanded 12 overexplains 12 overexplicit 12 overexploits 12 overexposing 12 overexposure 12 overextended 12 overfamiliar 12 overfatigued 12 overfatigues 12 overfavoring 12 overfavoured 12 overfeedings 12 overfineness 12 overfinished 12 overfishings 12 overflooding 12 overflourish 12 overflowings 12 overfocusing 12 overfocussed 12 overfocusses 12 overfondness 12 overfreedoms 12 overfreights 12 overfulfills 12 overfullness 12 overfundings 12 overfussiest 12 overgarments 12 overgenerous 12 overglancing 12 overglooming 12 overgoverned 12 overgrainers 12 overgraining 12 overgrassing 12 overgrazings 12 overgreedier 12 overgreening 12 overhandling 12 overhappiest 12 overharvests 12 overheatings 12 overhonoring 12 overhonoured 12 overhuntings 12 overidealise 12 overidealize 12 overidentify 12 overinclined 12 overindulged 12 overindulges 12 overinflated 12 overinflates 12 overinformed 12 overinsuring 12 overissuance 12 overkindness 12 overlaboring 12 overlaboured 12 overlaunched 12 overlaunches 12 overlearning 12 overleathers 12 overleavened 12 overlengthen 12 overlighting 12 overliterary 12 overlockings 12 overlordship 12 overmanaging 12 overmannered 12 overmannings 12 overmastered 12 overmatching 12 overmaturity 12 overmeasured 12 overmeasures 12 overmedicate 12 overmerriest 12 overmightier 12 overmodestly 12 overmounting 12 overmultiply 12 overnettings 12 overniceness 12 overnighters 12 overnighting 12 overofficing 12 overoperated 12 overoperates 12 overoptimism 12 overoptimist 12 overorganise 12 overorganize 12 overornament 12 overpackaged 12 overpackages 12 overpainting 12 overparented 12 overpayments 12 overpedaling 12 overpedalled 12 overpeopling 12 overperching 12 overpersuade 12 overpictured 12 overpictures 12 overpitching 12 overplanning 12 overplanting 12 overplotting 12 overpopulate 12 overpowering 12 overpraising 12 overprepared 12 overprepares 12 overpressing 12 overpressure 12 overprinting 12 overproduced 12 overproduces 12 overprograms 12 overpromised 12 overpromises 12 overpromoted 12 overpromotes 12 overprotects 12 overrashness 12 overreachers 12 overreaching 12 overreacting 12 overreaction 12 overreckoned 12 overrefining 12 overregulate 12 overreliance 12 overreported 12 overresponds 12 overripeness 12 overripening 12 overroasting 12 oversampling 12 oversanguine 12 oversaturate 12 overschutcht 12 overscutched 12 overserviced 12 overservices 12 overshadowed 12 overshooting 12 overshowered 12 oversimplify 12 overskipping 12 overslaughed 12 oversleeping 12 overslipping 12 overspenders 12 overspending 12 overspilling 12 overstaffing 12 overstaining 12 overstanding 12 oversteering 12 overstepping 12 overstinking 12 overstirring 12 overstitched 12 overstitches 12 overstocking 12 overstrained 12 overstressed 12 overstresses 12 overstrewing 12 overstridden 12 overstriding 12 overstriking 12 overstudying 12 overstuffing 12 oversubtlety 12 oversupplied 12 oversupplies 12 overswearing 12 oversweetens 12 overswelling 12 overswimming 12 overswinging 12 overtaxation 12 overteaching 12 overthinking 12 overthinning 12 overthrowers 12 overthrowing 12 overthwarted 12 overtightens 12 overtolerant 12 overtoppings 12 overtowering 12 overtradings 12 overtraining 12 overtreating 12 overtrimming 12 overtripping 12 overtrousers 12 overtrumping 12 overtrusting 12 overutilised 12 overutilises 12 overutilized 12 overutilizes 12 overvoltages 12 overwatching 12 overwatering 12 overwearying 12 overweathers 12 overweenings 12 overweighing 12 overweighted 12 overwhelming 12 overwintered 12 overwithheld 12 overwithhold 12 overwrapping 12 overwresting 12 overwrestled 12 overwrestles 12 ovipositions 12 owlishnesses 12 oxalacetates 12 oxaloacetate 12 oxidimetries 12 oxidisations 12 oxidizations 12 oxyacetylene 12 oxycephalies 12 oxycephalous 12 oxygenations 12 oxyhydrogens 12 oxysulphides 12 ozonisations 12 ozonizations 12 ozonospheres 12