12-Letter Words Starting With O
Looking for twelve-letter words that start with O? There are 441 of them in the tournament word lists, and every one is on this page. The most common, like ORGANIZATION, ORGANISATION, OPTIMIZATION, sit right at the top.
Unlike alphabetical lists that bury likely answers in the middle, this list is sorted by how often each word appears in everyday English. Scan the first rows for probable answers; dig deeper for rare, high-scoring plays.
Most common
- organization22
- organisation13
- optimization25
- observations17
- occupational18
- occasionally19
- overwhelming24
- osteoporosis14
- optimisation16
- oceanography23
- oscillations14
- orientations12
- optometrists16
- orthopaedics20
- obstructions16
- orchestrated18
- orienteering13
- oscilloscope18
- orthodontics18
- overshadowed23
All 441 words (the small number on each word is its Scrabble point value)
- overcrowding 22
- obsolescence 18
- overpayments 22
- outstretched 18
- overpowering 21
- outrageously 16
- overestimate 17
- outperformed 20
- outbuildings 16
- orthodontist 16
- overexposure 24
- obstetrician 16
- oppositional 16
- orthographic 23
- outplacement 18
- osteosarcoma 16
- otherworldly 22
- overcharging 22
- obliteration 14
- overburdened 19
- overthrowing 22
- originations 13
- osteogenesis 13
- opportunists 16
- ossification 17
- ostentatious 12
- orchestrator 17
- overreaction 17
- overspending 19
- overreaching 21
- overcapacity 24
- overextended 24
- osteoporotic 16
- overpressure 17
- overreacting 18
- orthorhombic 24
- obliterating 15
- outstripping 17
- oophorectomy 24
- overtraining 16
- omnipresence 18
- oligotrophic 20
- onomatopoeia 16
- orthopedists 18
- outrebounded 16
- octogenarian 15
- officeholder 24
- outcroppings 19
- overshooting 19
- osteomalacia 16
- occultations 16
- overproduced 21
- orchestrates 17
- orthogonally 19
- overstepping 20
- overexertion 22
- oversimplify 25
- otosclerosis 14
- osteoblastic 16
- overemphasis 22
- overeducated 19
- oxaloacetate 21
- outnumbering 17
- organoleptic 17
- objectivists 26
- ordinariness 13
- overstressed 16
- oppressively 22
- overactivity 23
- overprinting 18
- objectifying 30
- overachiever 23
- oxyacetylene 27
- obscurantism 18
- outgoingness 14
- obscurantist 16
- orientalists 12
- obstreperous 16
- obligatorily 18
- overbuilding 19
- overvoltages 19
- overwintered 19
- overabundant 18
- oversleeping 18
- oligarchical 20
- osteoclastic 16
- oblanceolate 16
- overstocking 22
- outlandishly 19
- overdramatic 20
- overreliance 17
- outdistanced 16
- overstrained 16
- overinflated 19
- oafishnesses 18
- oarsmanships 19
- obdurateness 15
- obfuscations 19
- objectivisms 28
- objurgations 22
- oblatenesses 14
- obligingness 16
- obliterative 17
- obliterators 14
- obnubilating 17
- obnubilation 16
- obscurations 16
- obsequiously 26
- obsoleteness 14
- obstructives 19
- obtusenesses 14
- occidentally 20
- oceanologies 15
- oceanologist 15
- ochlocracies 21
- octahedrally 21
- octapeptides 19
- octosyllabic 21
- octosyllable 19
- odiousnesses 13
- odontoblasts 15
- officialdoms 23
- officialeses 20
- officialisms 22
- officiations 20
- offishnesses 21
- offscourings 21
- oleaginously 16
- oleandomycin 20
- oleoresinous 12
- olfactometer 19
- oligochaetes 18
- oligophagies 19
- oligophagous 19
- oligopsonies 15
- omnipotences 18
- omnipotently 19
- omnisciences 18
- omnisciently 19
- omnivorously 20
- oncogenicity 20
- oncornavirus 17
- onomastician 16
- onomatopoeic 18
- onychophoran 25
- opalescences 18
- opalescently 19
- opaquenesses 23
- openhandedly 22
- operatically 19
- operationism 16
- operationist 14
- operatorless 14
- opinionative 17
- opportunisms 18
- opposability 21
- oppositeness 16
- optimalities 16
- oratorically 17
- orchestrally 20
- orchestrater 17
- orchidaceous 20
- organicities 15
- organologies 14
- orientalisms 14
- orientalized 22
- orientalizes 21
- orismologies 15
- ornamentally 17
- ornatenesses 12
- ornerinesses 12
- ornithologic 18
- ornithopters 17
- orographical 20
- oropharynges 21
- oropharynxes 27
- orotundities 13
- orthocenters 17
- orthodontias 16
- orthogeneses 16
- orthogenesis 16
- orthogenetic 18
- orthopterans 17
- orthopterist 17
- orthopteroid 18
- orthotropous 17
- oscillograms 17
- oscillograph 20
- osmolalities 14
- osmolarities 14
- ostentations 12
- osteogeneses 13
- osteological 15
- osteologists 13
- osteopathies 17
- osteoplastic 16
- osteoporoses 14
- ostracoderms 17
- otiosenesses 12
- otoscleroses 14
- outachieving 21
- outbalancing 17
- outbargained 16
- outbrazening 24
- outbreedings 16
- outcavilling 18
- outcompeting 19
- outdatedness 14
- outdelivered 17
- outdesigning 15
- outdistances 15
- outgalloping 16
- outgeneraled 14
- outglittered 14
- outintrigued 14
- outintrigues 13
- outjockeying 29
- outmaneuvers 17
- outmastering 15
- outorganized 23
- outorganizes 22
- outpoliticks 20
- outpopulated 17
- outpopulates 16
- outpreaching 20
- outproducing 18
- outpromising 17
- outreasoning 13
- outreckoning 19
- outreproduce 17
- outrivalling 16
- outscreaming 17
- outsiderness 13
- outsourcings 15
- outsparkling 19
- outspreading 16
- outspringing 16
- outsprinting 15
- outstretches 17
- outthrobbing 20
- outthrusting 16
- outtraveling 16
- outtravelled 16
- outwrestling 16
- ovariotomies 17
- overabstract 19
- overachieved 24
- overachieves 23
- overanalyses 18
- overanalysis 18
- overanalyzed 28
- overanalyzes 27
- overarousals 15
- overarranged 17
- overarranges 16
- overasserted 16
- overbalanced 20
- overbalances 19
- overbleached 23
- overbleaches 22
- overborrowed 21
- overbreeding 19
- overbriefing 21
- overbrowsing 21
- overcastings 18
- overcautions 17
- overcautious 17
- overchilling 21
- overclaiming 20
- overclassify 23
- overcleaning 18
- overclearing 18
- overclouding 19
- overcoaching 23
- overcoloring 18
- overcompress 21
- overconcerns 19
- overconsumed 20
- overconsumes 19
- overcontrols 17
- overcorrects 19
- overcounting 18
- overcramming 22
- overcritical 19
- overcropping 22
- overdecorate 18
- overdesigned 18
- overdevelops 21
- overdirected 19
- overdiscount 18
- overdocument 20
- overdominant 18
- overdressing 17
- overdrinking 21
- overeducates 18
- overemphases 22
- overemphatic 24
- overenamored 18
- overengineer 16
- overenrolled 16
- overequipped 29
- overexciting 25
- overexercise 24
- overexerting 23
- overexpanded 26
- overexplains 24
- overexplicit 26
- overexploits 24
- overexposing 25
- overfamiliar 20
- overfatigued 20
- overfatigues 19
- overfavoring 22
- overflooding 20
- overfocusing 21
- overfocussed 21
- overfocusses 20
- overfulfills 21
- overgarments 18
- overgenerous 16
- overgoverned 20
- overhandling 20
- overharvests 21
- overhonoring 19
- overhuntings 19
- overidealize 25
- overidentify 22
- overindulged 18
- overindulges 17
- overinflates 18
- overinformed 21
- overinsuring 16
- overissuance 17
- overlaboring 18
- overlearning 16
- overlengthen 19
- overlighting 20
- overliterary 18
- overlordship 21
- overmanaging 19
- overmannered 18
- overmastered 18
- overmatching 23
- overmaturity 20
- overmedicate 20
- overmodestly 21
- overnighters 19
- overnighting 20
- overoperated 18
- overoperates 17
- overoptimism 21
- overoptimist 19
- overorganize 25
- overornament 17
- overpackaged 25
- overpackages 24
- overpedaling 19
- overpedalled 19
- overpeopling 20
- overpersuade 18
- overplanning 18
- overplanting 18
- overplotting 18
- overpopulate 19
- overpraising 18
- overproduces 20
- overprograms 20
- overpromised 20
- overpromises 19
- overpromoted 20
- overpromotes 19
- overprotects 19
- overreachers 20
- overregulate 16
- overreported 18
- overresponds 18
- overroasting 16
- oversanguine 16
- oversaturate 15
- overserviced 21
- overservices 20
- overslaughed 20
- overslipping 20
- overspenders 18
- overspilling 18
- overstaffing 22
- oversteering 16
- overstirring 16
- overstresses 15
- overstrewing 19
- overstridden 17
- overstriding 17
- overstriking 20
- overstudying 20
- overstuffing 22
- oversupplied 20
- oversupplies 19
- oversweetens 18
- overswinging 20
- overtaxation 22
- overteaching 21
- overthinking 23
- overtightens 19
- overtreating 16
- overtrimming 20
- overtrumping 20
- overutilized 25
- overutilizes 24
- overwatching 24
- overwatering 19
- overwearying 22
- overweighing 23
- overweighted 23
- overwithheld 25
- overwithhold 25
- ovipositions 17
- owlishnesses 18
- oxalacetates 21
- oxygenations 23
- ozonizations 30
- ozonospheres 26
Points use Scrabble US letter values
Frequently asked questions
How many twelve-letter words are there that start with O?
There are 441 twelve-letter words that start with O in the tournament word lists. The most common are ORGANIZATION, ORGANISATION, OPTIMIZATION.
What are common twelve-letter words that start with O?
ORGANIZATION, ORGANISATION, OPTIMIZATION, OBSERVATIONS, OCCUPATIONAL are the most frequently used. The full list of 441 words on this page is sorted by everyday frequency, so the common ones come first.
Why are the words in this order?
Words are ranked by how often they appear in a trillion-word corpus of written English, most common first. That surfaces likely puzzle answers instead of hiding them mid-alphabet. Use the sort control to switch to alphabetical or points order.
Starting with O in other lengths
- 2-Letter Words Starting With O
- 3-Letter Words Starting With O
- 4-Letter Words Starting With O
- 5-Letter Words Starting With O
- 6-Letter Words Starting With O
- 7-Letter Words Starting With O
- 8-Letter Words Starting With O
- 9-Letter Words Starting With O
- 10-Letter Words Starting With O
- 11-Letter Words Starting With O
- 13-Letter Words Starting With O
- 14-Letter Words Starting With O
- 15-Letter Words Starting With O
- 16-Letter Words Starting With O
- 17-Letter Words Starting With O
- 18-Letter Words Starting With O
- 19-Letter Words Starting With O
- 20-Letter Words Starting With O