Words That Start With O
5,840 words start with O; 517 of them are common words, shown in bold.
The words, common first
2-letter words 12
od oe of oh om on op or os ow ox oy
3-letter words 45
oaf oak oar oat obe obi oca odd ode ods oes off oft ohm oho ohs oil oka oke old ole oms one ons ooh oot ope ops opt ora orb orc ore ors ort ose oud our out ova owe owl own oxo oxy
4-letter words 106
oaks oars oath oats obey odds odor offs ogre oils oily okay olds omen omit once ones only onto oops opal open opus oral orcs otto ouch ours outs oval oven over owed owes owls owns
Plus 70 rarer words.
5-letter words 181
oasis obese occur ocean oddly offer often oiled older olive omega onion onset opens opera opium opted optic orbit order organ other otter ought ounce outer ovens overs overt owing owned owner oxide ozone
Plus 147 rarer words — see the full list.
6-letter words 324
object oblige obtain occult occupy occurs oceans octane octave oculus offend offers office offset oilers oldest oldies olives onions onward opaque opened opener openly operas opioid oppose optics opting option oracle orally orange orbits orchid ordeal orders organs orient origin ornate orphan others otters ounces ousted outage outcry outfit outing outlaw outlet output outset overly owners owning oxford oxygen oyster
Plus 264 more words.
7-letter words 617
oatmeal obesity objects obliged obscene obscure observe obvious oceanic octopus odyssey offence offense offered officer offices ominous omitted onboard oneself ongoing onstage onwards opening operate opinion opposed opposes optical optimal optimum options oranges orbital orchard ordered orderly organic origins orioles orphans ottoman outcome outdoor outfits outlets outline outlook outpost outputs outrage outside outward ovarian overall overdue overlap overrun oversee oysters
Plus 557 more words.
8-letter words 972
objected observed observer obsessed obsolete obstacle obtained occasion occupied occupies occurred offences offended offender offenses offering officers official offshore openings operated operates operator opinions opponent opposing opposite optimism optional ordained ordering ordinary organise organism organize oriental oriented original orthodox outbreak outcomes outdated outdoors outgoing outlined outlines outraged outreach outright outsider overcome overdose overhaul overhead overload overlook override overseas overtime overview
Plus 912 more words.
9-letter words 922
obedience objection objective obligated oblivious obnoxious obscurity observers observing obsession obsessive obstacles obtaining obviously occasions occupancy occupants occupying occurring offenders offending offensive offerings officials offspring onslaught operating operation operative operators opponents oppressed optimized orchestra ordinance organised organisms organized organizer originals originate ornaments orphanage orthodoxy otherwise ourselves outbreaks outlining outsiders outskirts outspoken overboard overheard overnight overrated oversight oversized overthrow ownership oxidation
Plus 862 more words.
10-letter words 791
objections objectives obligation obligatory observable observance obstetrics obtainable occasional occupation occurrence officially oftentimes operations operatives opposition oppression oppressive optimistic optimizing orchestral ordinances ordinarily ordination organisers organising organizers organizing originally originated originates ornamental orthopedic ostensibly outfielder outlandish outpatient outperform outrageous overcoming overloaded overlooked overpriced overriding overseeing overtaking overthrown overturned overweight overworked
Plus 741 rarer words.
11-letter words 591
objectively objectivity obligations obliterated observation observatory obstructing obstruction occupations occurrences officiating operational opportunity organically orientation originality originating outnumbered outsourcing outstanding overarching overcrowded overflowing overheating overlapping overlooking overpowered overwhelmed
Plus 563 rarer words.
12-letter words 419
observations occasionally occupational optimization orchestrated organisation organization overcrowding overreacting overshadowed overwhelming
Plus 408 rarer words.
13-letter words 305
objectionable observational opportunistic opportunities organisations organizations
Plus 299 rarer words.
14-letter words 215
organizational overwhelmingly
Plus 213 rarer words.
15-letter words 159
Plus 159 rarer words.
16-letter words 76
Plus 76 rarer words.
17-letter words 40
objectionableness obstructivenesses oceanographically odoriferousnesses onomatopoetically openheartednesses openmouthednesses opinionatednesses opportunistically opprobriousnesses organophosphorous orthogonalization orthopsychiatries orthopsychiatrist otolaryngological otolaryngologists overambitiousness overcommercialize overcommunicating overcommunication overcompensations overconcentration overconscientious overembellishment overexaggerations overexploitations overextrapolation overfamiliarities overfertilization overindustrialize overorchestrating overprescriptions overproportionate overproportioning oversensitiveness oversensitivities oversophisticated oversubscriptions overzealousnesses ovoviviparousness
18-letter words 31
obstreperousnesses ophthalmologically opinionativenesses organophosphoruses orthogonalizations orthopsychiatrists oscillographically ostentatiousnesses otherworldlinesses overcapitalization overcentralization overclassification overcommercialized overcommercializes overcommunications overconcentrations overembellishments overextrapolations overfertilizations overgeneralization overidentification overindebtednesses overindustrialized overindustrializes overinterpretation overoptimistically overprotectiveness overrepresentation oversimplification overspecialization ovolactovegetarian
19-letter words 20
objectionablenesses otorhinolaryngology overambitiousnesses overcapitalizations overcentralizations overclassifications overcommercializing overdifferentiation overgeneralizations overidentifications overindustrializing overintellectualize overinterpretations overproportionately overrepresentations oversensitivenesses oversimplifications overspecializations ovolactovegetarians ovoviviparousnesses
20-letter words 5
overdifferentiations overenthusiastically overintellectualized overintellectualizes overprotectivenesses
21-letter words 4
otorhinolaryngologies otorhinolaryngologist overcommercialization overintellectualizing
22-letter words 3
otorhinolaryngological otorhinolaryngologists overcommercializations
23-letter words 1
overintellectualization
24-letter words 1
overintellectualizations
More word lists
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Questions people ask
How many words start with O?
Our list has 5,840. 517 of them are common everyday words; the rest are rarer words you are more likely to meet in Scrabble or a crossword than in conversation. The list is a public-domain English word list, sorted by how often each word appears in everyday writing.
What are the most common words that start with O?
OF, ON, OR, ONE, OUT — in that order, by how often they appear in everyday English.
What is a long common word that starts with O?
ORGANIZATIONAL — 14 letters, and still a word most people know.