12-Letter Words Starting With O
There are 419 twelve-letter words starting with O in our dictionary; 122 of them are common words.
Type your own letters to find only the 12-letter words you can make, or leave it empty to open this list in the word finder.
All 419 words
- organization22 points
- occasionally19 points
- optimization25 points
- overwhelming24 points
- observations17 points
- oceanography23 points
- overshadowed23 points
- overcharging22 points
- overcrowding22 points
- overthrowing22 points
- overpowering21 points
- orthopaedics20 points
- overstepping20 points
- overburdened19 points
- overshooting19 points
- obsolescence18 points
- occupational18 points
- orchestrated18 points
- oscilloscope18 points
- overprinting18 points
- overreacting18 points
- oversleeping18 points
- orchestrates17 points
- outnumbering17 points
- outstripping17 points
- overestimate17 points
- obstetrician16 points
- obstructions16 points
- onomatopoeia16 points
- opportunists16 points
- optometrists16 points
- orthodontist16 points
- outdistanced16 points
- outrageously16 points
- obliterating15 points
- outdistances15 points
- obliteration14 points
- oscillations14 points
- orientations12 points
- ostentatious12 points
- oversimplify25 points
- overextended24 points
- outperformed20 points
- outcroppings19 points
- overpopulate19 points
- orthodontics18 points
- outplacement18 points
- outstretched18 points
- outmaneuvers17 points
- outstretches17 points
- oxyacetylene27 points
- obsequiously26 points
- overexposing25 points
- officeholder24 points
- overachieved24 points
- overexposure24 points
- orthographic23 points
- overachiever23 points
- overachieves23 points
- overthinking23 points
- oppressively22 points
- otherworldly22 points
- overstocking22 points
- overproduced21 points
- overreaching21 points
- overbalanced20 points
- overproduces20 points
- oversupplied20 points
- outlandishly19 points
- overbalances19 points
- overspending19 points
- oversupplies19 points
- omnipresence18 points
- onomatopoeic18 points
- orthopedists18 points
- overabundant18 points
- overindulged18 points
- ossification17 points
- outbalancing17 points
- overcautious17 points
- overdressing17 points
- overindulges17 points
- overreaction17 points
- obstreperous16 points
- outbuildings16 points
- outspreading16 points
- overgenerous16 points
- octogenarian15 points
- osteoporosis14 points
- ordinariness13 points
- overexciting25 points
- overemphasis22 points
- overdevelops21 points
- obfuscations19 points
- operatically19 points
- overwintered19 points
- obscurantism18 points
- obscurantist16 points
- orienteering13 points
- orientalists12 points
- objectifying30 points
- overcapacity24 points
- overexercise24 points
- overexerting23 points
- objurgations22 points
- overexertion22 points
- overoptimism21 points
- oligarchical20 points
- omnivorously20 points
- overbuilding19 points
- overclouding19 points
- overcritical19 points
- overinflated19 points
- overprotects19 points
- obligatorily18 points
- outproducing18 points
- overdecorate18 points
- overmastered18 points
- overpraising18 points
- oratorically17 points
- obdurateness15 points
- orotundities13 points
- overexplicit26 points
- oophorectomy24 points
- orthorhombic24 points
- overemphatic24 points
- overmatching23 points
- openhandedly22 points
- orientalized22 points
- overcropping22 points
- overstuffing22 points
- overtaxation22 points
- octosyllabic21 points
- opposability21 points
- orientalizes21 points
- officialeses20 points
- officiations20 points
- oncogenicity20 points
- orchestrally20 points
- orchidaceous20 points
- orographical20 points
- oscillograph20 points
- overfamiliar20 points
- overfatigued20 points
- overmedicate20 points
- overtrumping20 points
- oarsmanships19 points
- octosyllable19 points
- omnipotently19 points
- omnisciently19 points
- orthogonally19 points
- overeducated19 points
- oligochaetes18 points
- ornithologic18 points
- orthogenetic18 points
- overcastings18 points
- obliterative17 points
- opinionative17 points
- orchestrator17 points
- ornamentally17 points
- orthopterans17 points
- orthotropous17 points
- oscillograms17 points
- ostracoderms17 points
- overpressure17 points
- obligingness16 points
- oppositeness16 points
- oppositional16 points
- orthogenesis16 points
- osteomalacia16 points
- osteoplastic16 points
- osteoporotic16 points
- overregulate16 points
- overstrained16 points
- overstressed16 points
- overstresses15 points
- oblatenesses14 points
- obsoleteness14 points
- osteoporoses14 points
- outgeneraled14 points
- osteogenesis13 points
- ozonizations30 points
- overequipped29 points
- objectivisms28 points
- overanalyzed28 points
- oropharynxes27 points
- overanalyzes27 points
- objectivists26 points
- overexpanded26 points
- ozonospheres26 points
- onychophoran25 points
- overidealize25 points
- overorganize25 points
- overpackaged25 points
- overutilized25 points
- overwithheld25 points
- overwithhold25 points
- overexplains24 points
- overexploits24 points
- overpackages24 points
- overutilizes24 points
- officialdoms23 points
- opaquenesses23 points
- outorganized23 points
- overactivity23 points
- overbleached23 points
- overclassify23 points
- overcoaching23 points
- overweighing23 points
- overweighted23 points
- oxygenations23 points
- officialisms22 points
- outorganizes22 points
- overbleaches22 points
- overcramming22 points
- overemphases22 points
- overfavoring22 points
- overidentify22 points
- overpayments22 points
- overstaffing22 points
- ochlocracies21 points
- octahedrally21 points
- offishnesses21 points
- offscourings21 points
- oropharynges21 points
- outachieving21 points
- overborrowed21 points
- overbrowsing21 points
- overchilling21 points
- overcompress21 points
- overdrinking21 points
- overfocusing21 points
- overfocussed21 points
- overfulfills21 points
- overharvests21 points
- overinformed21 points
- overlordship21 points
- overmodestly21 points
- overserviced21 points
- oxalacetates21 points
- oxaloacetate21 points
- occidentally20 points
- oleandomycin20 points
- oligotrophic20 points
- outpoliticks20 points
- outpreaching20 points
- outthrobbing20 points
- overclaiming20 points
- overconsumed20 points
- overdocument20 points
- overdramatic20 points
- overfocusses20 points
- overgoverned20 points
- overhandling20 points
- overlighting20 points
- overmaturity20 points
- overnighting20 points
- overpeopling20 points
- overprograms20 points
- overpromised20 points
- overpromoted20 points
- overreachers20 points
- overservices20 points
- overslaughed20 points
- overslipping20 points
- overstriking20 points
- overswinging20 points
- overtrimming20 points
- obstructives19 points
- octapeptides19 points
- olfactometer19 points
- oligophagies19 points
- oligophagous19 points
- opalescently19 points
- outcompeting19 points
- outsparkling19 points
- overabstract19 points
- overconcerns19 points
- overconsumes19 points
- overcorrects19 points
- overdirected19 points
- overfatigues19 points
- overhuntings19 points
- overlengthen19 points
- overmanaging19 points
- overnighters19 points
- overoptimist19 points
- overpedaling19 points
- overpedalled19 points
- overpromises19 points
- overpromotes19 points
- overstrewing19 points
- overtightens19 points
- overvoltages19 points
- overwatering19 points
- oafishnesses18 points
- omnipotences18 points
- omnisciences18 points
- opalescences18 points
- opportunisms18 points
- orthopteroid18 points
- outcavilling18 points
- overanalyses18 points
- overanalysis18 points
- overcleaning18 points
- overclearing18 points
- overcounting18 points
- overdesigned18 points
- overdiscount18 points
- overdominant18 points
- overeducates18 points
- overenamored18 points
- overgarments18 points
- overinflates18 points
- overlaboring18 points
- overliterary18 points
- overmannered18 points
- overoperated18 points
- overpersuade18 points
- overplanning18 points
- overplanting18 points
- overplotting18 points
- overreported18 points
- overresponds18 points
- overspenders18 points
- oversweetens18 points
- owlishnesses18 points
- obnubilating17 points
- oncornavirus17 points
- orchestrater17 points
- organoleptic17 points
- ornithopters17 points
- orthocenters17 points
- orthopterist17 points
- osteopathies17 points
- outdelivered17 points
- outpopulated17 points
- outpromising17 points
- outreproduce17 points
- ovariotomies17 points
- overarranged17 points
- overcautions17 points
- overcontrols17 points
- overissuance17 points
- overoperates17 points
- overornament17 points
- overreliance17 points
- overstridden17 points
- overstriding17 points
- ovipositions17 points
- oblanceolate16 points
- obnubilation16 points
- obscurations16 points
- occultations16 points
- oleaginously16 points
- onomastician16 points
- operationism16 points
- optimalities16 points
- optimisation16 points
- orthodontias16 points
- orthogeneses16 points
- osteoblastic16 points
- osteoclastic16 points
- osteosarcoma16 points
- outbargained16 points
- outbreedings16 points
- outpopulates16 points
- outrebounded16 points
- outrivalling16 points
- outthrusting16 points
- outwrestling16 points
- overarranges16 points
- overasserted16 points
- overengineer16 points
- overenrolled16 points
- overinsuring16 points
- overlearning16 points
- oversanguine16 points
- overstirring16 points
- overtraining16 points
- overtreating16 points
- oceanologies15 points
- oceanologist15 points
- odontoblasts15 points
- oligopsonies15 points
- organicities15 points
- orismologies15 points
- osteological15 points
- outdesigning15 points
- outsourcings15 points
- outsprinting15 points
- overarousals15 points
- oversaturate15 points
- obliterators14 points
- obtusenesses14 points
- operationist14 points
- operatorless14 points
- organologies14 points
- orientalisms14 points
- osmolalities14 points
- osmolarities14 points
- otoscleroses14 points
- otosclerosis14 points
- outdatedness14 points
- outglittered14 points
- outgoingness14 points
- outintrigued14 points
- odiousnesses13 points
- organisation13 points
- originations13 points
- osteogeneses13 points
- osteologists13 points
- outintrigues13 points
- outsiderness13 points
- oleoresinous12 points
- ornatenesses12 points
- ornerinesses12 points
- ostentations12 points
- otiosenesses12 points
Quick facts
- Total words: 419
- By usage: 40 very common, 82 common, 297 rare
Highest scoring (classic tiles)
- objectifying 30
- ozonizations 30
- overequipped 29
- objectivisms 28
- overanalyzed 28
- oropharynxes 27
- overanalyzes 27
- oxyacetylene 27
- objectivists 26
- obsequiously 26
Most common
- organization
- occasionally
- optimization
- overwhelming
- observations
- oceanography
- overshadowed
- overcharging
- overcrowding
- overthrowing
Definitions
- organization (noun)
- A group of people who work together.
- occasionally (adverb)
- Sporadically and infrequently.
- optimization (noun)
- The act of rendering optimal.
- overwhelming (adjective)
- So strong as to be irresistible.
Words that start with O come up constantly in tile games, crosswords and daily letter puzzles, and this page gathers all 419 of the twelve-letter ones. The most useful are the common words at the top of the list; the rare ones at the bottom are worth knowing when you need to hook onto an awkward board position. OBJECTIFYING is the top scorer here, worth 30 points before any board multiplier.
How to use this page
To use this page, start with the search box. Type the letters on your rack, add a question mark for each blank, and press search. The tool keeps this page's constraint and returns only the words you can spell. Below the box, the full list is arranged with common words first, followed by the quick facts, definitions and related lists.
Tips
Every score badge on this page is the sum of the tile values in the word, with no board multipliers applied. Classic tiles value the common letters at one point and the awkward letters higher, up to ten for Q and Z. Blank tiles score nothing. The actual points you earn depend on where the word lands, so a modest word on a double-word square beats a high-value word on plain squares. Use the badges to compare words quickly, then check the board for the multiplier that changes the picture.
Questions
What is the highest-scoring word among the twelve-letter words starting with O?
OBJECTIFYING scores 30 points with classic tile values, ignoring board multipliers. The full top ten is in the quick facts above; switch the tile set on the search tool if you play with different letter values.
Why are some of these words unfamiliar?
297 of the 419 words on this page are tagged rare, meaning they fall outside the usual spell-check vocabulary. They are still real words, and many are legal plays, but you should expect a challenge if someone asks you to define them.