Synonyms: words starting with O
274 words starting with O that have a synonyms page, each shown with its closest synonyms.
- oaffool, dummy, auf
- obdurateunyielding, headstrong, unrepentant
- obeahspell, charm, mojo
- obechesamba, African maple, African whitewood
- obedientcompliant, toward
- obeserotund, round
- obeymind, assent
- obfuscateeclipse, darken, overshadow
- objectthing, article, item
- objectifyreify, objectivize, thingify
- objectivefair-minded, neutral, candid
- objurgationlecture, sermon, scolding
- obligatealso: force: Synonyms, binding, compulsatory
- obligatorilyobligately, necessarily, mandatorily
- obliqueslanting, aslant, askew
- obliquitycorruption, sin, wrongdoing
- obliterateeliminate, ruin, harry
- obloquyopprobrium, defamation, abuse
- obnoxiousannoying, disgusting, unpleasant
- obsceneshocking, dirty, vulgar
- obscurevague, low-profile, gloomy
- obsequiousservile, greasy, sycophantic
- observantheavenly-minded, practicing, Allah-fearing
- obsolescencedisuse, superannuation, desuetude
- obsoleteold-fashioned, elderly, unemployed
- obsoletionobsolescence, disuse, superannuation
- obstaclebarrier, impediment, hindrance
- obstinacystubbornness, self-will, intransigence
- obstinatestubborn, self-willed, dogged
- obstreperousdogged, refractory, unyielding
- obstructblock, hinder, foul
- obstructionblock, obstacle, stop
- obtainget, acquire, exact
- obtainmentacquisition, procurement, acquirement
- obtentionacquiral, acquiring, acquisition
- obtrusiveintrusive, overassertive, overbearing
- obtuseblunt, dull, obtuse-angled
- obverselike, facing
- obviatepreclude, obviative, avert
- obviousapparent, evident, bait
- obviouslyclearly, openly, evidently
- occasionmoment, event, happening
- occasionallysometimes, intermittently, sporadically
- occupationwork, employment, calling
- occupybusy, employ
- occurhappen, belimp, appear
- occurrenceevent, episode, happening
- ocean perchbergylt, rose fish, rockfish
- octetogdoad, octonary
- octothorpehash, hashtag, number sign
- oddweird, strange, unusual
- odd fishweirdo, abnormality, deviant
- oddballweirdo, kook, odd duck
- oddityfreak, strangeness, queerness
- oddmentremainder, fragment, offcut
- odds and sodsodds and bods, odds and ends, bouillabaisse
- OdinAll-Father, Wotan, Woden
- odioushated, despicable, detestable
- odorscent, perfume, odour
- odoriferousodiferous, odoriferant
- of a certain agegetting on in years, on in years, long in the tooth
- of a piecemonolithic, of a kind, of a blood
- of courseindisputably, naturally, absolutely
- of meanswell-to-do, affluent, prosperous
- of one's own accordspontaneously, at one's own instigation, autonomously
- ofayhonky, whitey, abelungu
- off the batfrom the get-go, off the rip, off rip
- off the markwide of the mark, off base, off-track
- off-licencebeer-off, bottle shop, offy
- offbeatoddball, free spirit, heteroclite
- offendwound, abuse, slur
- offensewrong, crime, error
- offenselessrighteous, pure, blameless
- officeservice, Divine Office, breviary
- offishremote, reserved, aloof
- offsetequivalence, countervail, compensate for
- offspringchild, lineage, progeny
- oftenoftentimes, ofttimes, repeatedly
- Ogeechee limeNyssa capitata, river lime, ogeechee lime tree
- oh yeahyes, yeah, yeah right
- oiledoily, oleose, oiled up
- oilyoilish, oillike, slick
- ointmentsalve, unguent, pomatum
- okragumbo, bhindi
- oldone-time, former, ancient
- old ageage, senescence, superannuation
- Old BelieverRascolnik, Old Ritualist, Raskolnik
- old handveteran, insider
- old hatbanal, commonplace, cliché
- old ladyold woman, babushka, bag
- old manwhitebeard, greybeard
- Old NickDevil, Dragon, Lucifer
- Old SerpentDevil, Dragon, Lucifer
- old womanbabushka, carline, wife
- old-fashionedold-time, outdated, elderly
- old-timerelderly, mzee
- oldenbygone, auld, elden
- oldieantique, classic, oldster
- oldnessagedness, elderliness, senectitude
- oldstergeezer, old timer, senior citizen
- oleaginousunctuous, oily, sebaceous
- oliomishmash, oddments, bouillabaisse
- omensign, harbinger, portent
- ominousstar-crossed, ill-starred, dire
- omissibleomittable, optional, needless
- omitexclude, skip
- omnipotentall-powerful, almighty, plenipotentiary
- omnium-gatherummiscellany, welter, mingle-mangle
- onapropos, about
- on fireburning, afire, aflame
- on purposeintentionally, deliberately, purposefully
- on the boilimpending, looming, on the burst
- on the contrarycontrariwise, au contraire, if anything
- on the groundin the field, on the spot, on location
- on the horns of a dilemmabetween a rock and a hard place, between Scylla and Charybdis, damned if one does and damned if one doesn't
- on the levelabove board, on the square, on the up and up
- on the movemoving, mobile, dynamic
- on the noseon the button, on the dot, heavy-handed
- on the other handbut, however, still
- on the pisson the grog, on the lash, on the razz
- on the runon the lam, hot, in retreat
- on the slyfurtively, clandestinely, on the down-low
- on the spotright away, then and there, on the stand
- onceformerly, one time, immediately
- once againanew, afresh, again
- once and for allfinally, eventually, ultimately
- once in a blue moonseldom, infrequently
- once in a whilesometimes, intermittently, sporadically
- onesingle, generic you, sort
- one daysomeday, one of these days, some day
- one-offunique, nonce, one-shot
- onenessunity, unicity
- onerone of a kind, long shot, continuous shot
- onerousburdensome, difficult, wearing
- onlinessaloneness, onlyhood, uniquity
- onlyone, single, sole
- onomatopoeiaonomatope, phonomime, echoism
- onomatopoeicimitative, onomatopoetic
- onsetstart, beginning, birth
- oodlesabundance, battalion, arseload
- oofouch, ackers, bees and honey
- oopsoopsy, uh-oh, whoops
- opahkingfish, Jerusalem haddock, moonfish
- opaquethick, nontransparent
- openopen-face, open-faced, free
- open-mindedbroad-minded, liberal, tolerant
- opening hoursoffice hours, business hours, shop-hours
- openlyvisibly, blatantly, overtly
- opinionchoice, award, decision
- opiumopiate, ze, ope
- opponentantagonist, adversary
- opportuneproper, seasonable, appropriate
- opposefight, counter, confront
- oppositepolar, polar opposite, vis-à-vis
- oppressupset, unhappy, grieve
- oppressivedemanding, domineering, tyrannical
- opprobriumobloquy, opprobry, blame
- optimaloptimum, ideal, best
- optimizeperfect, enhance, hone
- optionaldiscretionary, elective, facultative
- oracleforeteller, prophet, expert
- oral sexneck, brain, dome
- orangecoral, amber, yellow-red
- orange hawkweedfox-and-cubs, grim-the-collier
- orationeulogy, address
- orbsphere, ball
- orbiteye socket, cranial orbit, launch
- orcablackfish, grampus, killer
- orderordo, degree, sort
- orderlyregular, shipshape
- ordinarilycommonly, conventionally, customarily
- ordinarystandard, normal, average
- ordurestool, pooh, caca
- organ gunribauldequin, infernal machine, mitrailleur
- organizearrange, tidy, formulate
- organizercontroller, comptroller, head
- orgasmrelease, come, cum
- orgasmicthrilled, delighted, joyful
- orgulousdisdainful, prideful, airy
- orientorientate, East, Orient red
- originbeginning, source, zero vector
- originalprimary, initial, prototype
- originallyinitially, at first, innovatively
- originatecoin, begin
- ornamentornamentation, adornment, embellishment
- ornamentationdecoration, ornament, adornment
- ornerycontrary, crabby, cross-grained
- orotundresounding, rotund, tympanic
- ortscrap, chip, bit
- orthodoxroutine, proper, conventional
- oscitanttired, drowsy, dozy
- ospreyossifrage, fish eagle, fish hawk
- ossiclebonelet, ossiculum
- ostensiblyapparently, reportedly, allegedly
- ostentdemonstrate, display, ostentate
- ostentateostent, exhibitionize, swagger
- ostentationpomp, show, pageantry
- ostracismavoidance, shunning, blacklisting
- ostracizeblackball, disregard
- otheralternate, foreign, additional
- otherwiseelsewise, contrarily, contrastingly
- otherworldlyethereal, unworldly
- otioseineffective, ineffectual, vain
- OttawaOttawa-Hull, Ottawa-Gatineau
- ottomanhassock, footstool, pouffe
- ouchow, yow, youch
- ounceonza, oz., ℥
- oustdismiss, banish, eject
- outunchic, through, come to light
- out offrom, in, of
- out of handoffhand, chaotic, messy
- out of italoof, excluded, left out
- out of one's mindoff one's head, out of one's box, out of one's cotton-picking mind
- out of placeatopic, dislocated, dystopic
- out of sighthidden, invisible, unseen
- out of touchincommunicado, in the dark, out of the loop
- out-and-outstraight-out, complete, utter
- outburntorch, combust, burn
- outburstblast, firestorm, upheaval
- outcastoutsider, abject, pariah
- outdatedsuperseded, fusty, parachronistic
- outdoeclipse, to outperform, to outrival
- outdooropen-air, out-of-door, alfresco
- outfoxoutwit, outguess, outmaneuver
- outgooutdo, outdistance, outrun
- outhouseprivy, netty
- outlanderoutcomeling, fremd, outener
- outlandishunusual, odd, weird
- outlawbandit, fugitive
- outlookprospect, perspective, viewpoint
- outmodedold-fashioned, elderly, obsolete
- outragewrong, atrocity, wickedness
- outrightquite, absolutely, altogether
- outsiderstranger, foreigner, outcast
- outstripoverhaul, overgo, overtake
- outwitoutsmart, circumvent, outfox
- ovalellipse, ovular, ovate
- overactham, chew the scenery, ham it up
- overallbig, entire, total
- overburdenmullock, inundate, overload
- overchargegouge, hyperbolize, overstate
- overcomehurdle, vanquish, overtake
- overconfidentoverweening, arrogant, cocky
- overdothree-sheet, exaggerate, overstate
- overdriveOD, O/D, O.D.
- overduetardy, belated, late
- overemotionalcorny, overwrought, kitschy
- overemphasizethree-sheet, exaggerate, overdo
- overestimateoverstate, overrate, overapproximate
- overgooutstrip, cross
- overjoyedthrilled, merry, cheerful
- overladenfilled, crowded, inundated
- overlookignore, miss, survey
- overlordtyrant, liege lord, chief lord
- overmuchexcessive, extreme, undue
- overpassoverlook, surpass, miss
- overpraiseflannel, toady, overrate
- overrateflannel, toady, overestimate
- overreachsurpass, cap
- overreckonoverestimate, overstate, overrate
- overseercontroller, supervisor, comptroller
- overshadowdwarf, surpass, outdo
- overstatethree-sheet, overestimate, exaggerate
- overtpatent, open
- overthinkoverapproximate, overstate, overestimate
- overthwartacross, athwart, adverse
- overweeningarrogant, vain, cocky
- overweightobesity, fat, morbidly obese
- overwhelmgrip, swamp, overwhelmedness
- owing toas a consequence of, as a result of, because of
- owlyowlish, owllike, grumpy
- ownacquire, to possess, have to one's name
- ownershippossession, proprietorship, propriety
- oxeye daisymarguerite, dog daisy, moon daisy
Source and license
Synonyms and antonyms adapted from the Wiktionary entry of each word. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws grouped them by meaning and gave each word its own synonyms page. Wiktionary data of 2026-09-02.
Cite this page: “Synonyms for Words Starting with O.” Word.ws, https://word.ws/synonyms/a-z/o. Based on Wiktionary, CC BY-SA 4.0.