13 Letter Words Starting With O

Every 13-letter word that starts with the letter O, in alphabetical order. Tap any word for its definitions, syllables and game scores.

ALL WORDS A TO Z

oath breaking22 oath-breaking22 obiter dictum19 object lesson23 objectionable26 objectionably29 objectiveness27 objectivistic29 objectivizing37 objurgatively29 objurgatorily26 oblique angle24 obliviousness18 oblong-leaved19 oblong-linear15 obnoxiousness22 observability23 observational18 observed fire21 obsessionally18 obsessiveness18 obsolescently20 obstacle race18 obstetrically20 obstinateness15 obstructingly21 obstructively23 obstructivity23 obtrusiveness18 obtuse-angled16 occam's razor26 occasionalism19 occasionality20 occidentalise18 occidentalism20 occidentalist18 occidentality21 occidentalize27 occlusiveness20 ocean current16 ocean sunfish20 oceanic abyss21 oceanographer21 oceanographic23 ocher-colored20 ochlocratical22 octagon scale17 octane number18 octane rating15 octocentenary20 octodecillion18 ocular muscle18 oculus dexter22 odds and ends15 odo of lagery19 odontoblastic18 odontoglossum17 odontographic22 odontological17 odontophorine19 odoriferosity20 odoriferously20 oedogoniaceae17 oehlenschlger22 oeil de boeuf17 oeil-de-boeuf17 of sound mind18 off her guard22 off his guard22 off-reckoning25 off-the-clock28 off-the-shelf26 offenselessly22 offensiveness22 office bearer22 office lawyer26 office seeker24 office worker27 office-bearer22 officer plant22 official oath23 officialising22 officializing31 officiousness21 ogoouor ogowe17 oil distiller13 oil extractor21 oil geologist14 oil of cloves19 oil whetstone18 oil-hardening17 oil-rich seed17 oklahoma city26 old bulgarian16 old fashioned20 old icelandic18 old ironsides14 old northwest19 old pretender16 old testament15 old world jay26 old world yew22 old-fashioned20 olduvai gorge18 ole bornemann16 olea europaea14 oleander fern16 olefin series15 oleomargarine16 olericultural15 olfactory pit22 oligochaetous19 oligocythemia24 oligopolistic18 olive-colored18 olive-growing20 olympian zeus28 olympic games24 omental bursa16 ommatophorous22 omni-ignorant15 omnibus train16 omnicompetent21 omomyid group23 omplex number27 on the button16 on your guard16 on-off switch25 on/off switch25 one at a time12 one-billionth17 one-hundredth20 one-millionth17 one-sidedness14 one-sixteenth22 one-upmanship21 only-begotten18 onomatologist16 onomatopoetic19 ononis repens14 ontogenically19 onus probandi17 onward course18 onward motion18 opacification22 opaline green15 open brethren19 open fracture19 open interval17 open juncture23 open marriage17 open position16 open question23 open sandwich23 open sentence16 open sequence25 open throttle17 open-and-shut17 open-collared17 open-end fund18 open-flowered21 open-handedly22 open-mindedly21 open-sequence25 open-timbered19 opening night19 opera comique27 opera company23 opera glasses15 operatic star16 operationally18 operativeness18 operator gene15 ophiodontidae20 ophorectomize31 ophthalmology27 opinionatedly19 opisthobranch25 opium drinker21 opium-smoking23 opportuneness17 opportunistic19 oppose change22 opposite word20 oppositionary20 opprobriously22 opsonic index24 optative mood20 opthalmoscope24 optic chiasma23 optical bench23 optical crown21 optical fiber21 optical fibre21 optical flint19 optical glass17 optical maser18 optical prism20 ora pro nobis15 oral contract16 oral evidence18 orange balsam17 orange grower17 orange madder17 orange maggot17 orange peeler15 orange quince24 orange sulfur16 orange yellow19 orange-flower19 orange-headed18 orange-rufous16 orange-shaped19 orange-winged18 orange-yellow19 orate fratres15 orbicularness17 orbital plane16 orbital point16 orchard fruit21 orchard grass19 orchard valve24 orchestra pit19 orchestraless18 orchestrating19 orchestration18 orchid cactus22 orchid family26 orchidologist20 order acarina15 order araneae13 order bryales18 order caudata16 order cestida16 order cetacea17 order diptera16 order fagales17 order fucales18 order isopoda16 order musales15 order myaceae20 order odonata14 order oleales13 order protura15 order ranales13 order rosales13 order sirenia13 order taxales20 order ulvales16 order uropygi19 ordinary care18 ordzhonikidze40 orectolobidae18 oregon jargon21 oregon myrtle18 organ erector15 organ gallery17 organ whistle19 organ-blowing19 organ-grinder15 organic being18 organicalness16 organogenesis15 organographic22 organotherapy22 oriental sore12 orientalising14 originatively20 orinoco river17 ornamentalism17 ornamentalist15 ornamentality18 ornamentation15 ornithischian21 ornithologist17 ornithomimida21 orobanchaceae22 oropharyngeal22 orpine family22 orthocephalic25 orthognathous20 orthogonality20 orthogonalize26 orthographise22 orthographize31 orthohydrogen24 orthostichous21 os triquetrum23 oscillometric19 osteoblastoma17 osteomyelitis18 osteopetrosis15 ostracization24 oswald veblen21 other-worldly22 otic ganglion16 otto meyerhof23 oubangi-chari20 out of bounds17 out of pocket22 out-and-outer12 out-migration15 out-of-bounds17 out-of-pocket22 out-of-school19 outcompliment21 outdistancing17 outdoor sport15 outdoor stage14 outdoorswoman19 outequivocate27 outer garment15 outer station12 outjourneying24 outpopulating18 outpracticing20 output device20 output signal15 outsatisfying20 outspokenness19 outstandingly18 outtravelling17 outtyrannized26 outvociferate21 outward-bound19 ovariectomize29 ovate-cordate18 ovate-cuneate17 ovate-deltoid17 over and over18 over-abundant18 over-crowding22 over-delicate18 over-exercise24 over-pressure17 over-the-hill20 overabundance21 overactivated22 overaddiction20 overadvancing23 overaggravate21 overagitating18 overagitation17 overambitious20 overanalyzing29 overanimation18 overannotated17 overanxiously26 overappareled21 overappraisal20 overappraised21 overassertion16 overassertive19 overattention16 overattentive19 overattenuate16 overbalancing21 overbearingly22 overbounteous18 overbrilliant18 overbrutality21 overbrutalize27 overbulkiness22 overbumptious22 overcarefully24 overcertified22 overcherished25 overcivilized31 overcompliant22 overcondensed20 overconfident22 overconscious20 overconsuming21 overcontented19 overcourteous18 overcredulity22 overcredulous19 overcriticism22 overcriticize29 overcrowdedly26 overcultivate21 overcuriosity21 overcuriously21 overdecadence22 overdecorated20 overdedicated21 overdefensive23 overdelicious19 overdependent20 overdescribed22 overdiffusing24 overdiffusion23 overdignified22 overdiligence20 overdiversify26 overdiversity23 overdogmatism22 overdominated20 overdramatise19 overdramatize28 overeagerness17 overeducating20 overeducation19 overeducative22 overelaborate18 overembellish23 overembroider21 overemotional18 overemphasise23 overemphasize32 overempirical22 overemulating19 overemulation18 overestimated19 overexcitable27 overexcitably30 overexercised26 overexertedly27 overexpansion25 overexpansive28 overexpectant27 overexquisite32 overexuberant25 overfatiguing21 overfavorable24 overfeminized31 overfertility22 overflowingly26 overformalize30 overfrequency33 overfrugality23 overgeniality20 overgraduated19 overgratified21 overgratitude18 overhand knot23 overhappiness23 overhastiness19 overhaughtily26 overhead door20 overheadiness20 overheaviness22 overhostility22 overhumanized31 overidealized27 overimitating19 overimitation18 overimitative21 overimmunized30 overinclining19 overindulgent18 overindulging19 overinflating20 overinflation19 overinfluence21 overinhibited22 overinsistent16 overinsolence18 overintensify22 overintensity19 overinvolving23 overjudicious26 overlactating19 overlactation18 overland park22 overlaudation17 overlaudatory20 overlay glass19 overlegislate17 overliberally21 overloftiness19 overlubricate20 overlustiness16 overluxuriant23 overluxurious23 overmagnified23 overmagnitude20 overmasterful21 overmelodious19 overmerriment20 overmerriness18 overmitigated20 overmobilized30 overmodernize28 overmodifying26 overmoralized28 overmortgaged21 overmystified25 overnegligent18 overnight bag22 overnobleness18 overnormality21 overnormalize27 overobedience21 overobjectify33 overoffensive25 overofficious24 overorganized27 overorganpast19 overoxidizing34 overpatriotic20 overpenalized28 overpersecute20 overpessimism22 overplausible20 overplenitude19 overplenteous18 overplentiful21 overpoeticize29 overpolemical22 overpolitical20 overpollinate18 overponderous19 overpopulated21 overpotential18 overpraticing21 overprecision20 overpreoccupy27 overprolixity28 overprominent20 overpromising21 overpronounce20 overprovident22 overproviding23 overprovision21 overprovoking26 overpublicity25 overpublicize31 overpurchased24 overqualified29 overreadiness17 overrealistic18 overreckoning23 overreduction19 overregulated18 overreligious17 overrepresent18 overreprimand21 overrestraint16 overretention16 overrighteous20 oversaturated17 oversceptical22 overscrubbing23 oversecreting19 oversecretion18 oversensitive19 oversensitize25 overservility22 overshielding21 overskeptical24 oversocialize27 oversolemnity21 oversorrowful22 overspeculate20 overspreading20 oversqueamish30 overstatement18 oversteadfast20 overstimulate18 overstridence19 overstridency22 overstringing18 oversubscribe22 oversupplying24 oversweetness19 overtalkative23 overtechnical23 overtenacious18 overtheorized29 overthriftily25 overtinseling17 overtinselled17 overtolerance18 overtorturing17 overtreatment18 overunionized26 overurbanized28 overvaluation19 overvariation19 overvehemence26 overventilate19 overventurous19 overweeningly23 overzealously28 oviparousness18 ovoviviparism26 ovoviviparity27 ovoviviparous24 ovverirrigate20 owl butterfly23 own authority21 ox-eyed daisy26 oxalis cernua21 oxford accent27 oxford chrome30 oxford corner25 oxford theory29 oxidizability35 oxygen effect31 oxyhemoglobin31 oxytocic drug28 oyster agaric18 oyster dredge18 oyster farmer20 oyster fungus19 oyster plover20 oyster-shaped21 oystercatcher23 ozark plateau27

13 LETTER WORDS BY FIRST LETTER26

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

O WORDS BY LENGTH14

2-letter O words 3-letter O words 4-letter O words 5-letter O words 6-letter O words 7-letter O words 8-letter O words 9-letter O words 10-letter O words 11-letter O words 12-letter O words 13-letter O words 14-letter O words 15-letter O words

See the bigger listsAll 13 letter words, or every word starting with O.

13 letter words Words starting with O