Words starting with O

There are 5,650 words starting with O in our word list. 299 of them are common everyday words, such as OF, ON, OR and OTHER. They range from 2 to 15 letters, and 8-letter words are the biggest group, with 970.

Words: 5,650
Common words: 299
Longest: OBJECTIFICATION; 15 letters
Top score: OXYPHENBUTAZONE; 41 points

O often pairs with another vowel (OO, OU, OI, OA), and the ending -OUS marks many adjectives, such as FAMOUS and NERVOUS.

Need a pattern or to leave letters out? Open this list in the word finder.

2-letter words (12)

3-letter words (45)

4-letter words (106)

only
over
once
okay
ones
open
onto
odds
oral
ours
oven
owns
oaks
oath
obey
offs
oils
olds
oops
otto
ouch
outs
oval
owed
owes
oars
oats
odor
ogre
oily
omen
omit
opal
opus
orcs
owls
oboe
odes
ogle
ohms
okra
omer
onus
onyx
ooze

See all 106 in the word finder

5-letter words (181)

other
offer
often
order
ocean
older
owned
owner
occur
olive
opens
opera
orbit
organ
ought
outer
oasis
obese
oddly
omega
onion
onset
opted
optic
ounce
overs
owing
oxide
oiled
opium
otter
ovens
overt
ozone
oaths
obeys
ochre
odeon
odors
odour
offal
olden
oldie
ombre
omens

See all 181 in the word finder

6-letter words (323)

office
others
object
offers
opened
option
orange
orders
origin
owners
obtain
occurs
oldest
openly
organs
outfit
outlet
output
oxford
oxygen
occupy
oceans
offend
offset
onions
opener
oppose
optics
oracle
orphan
ounces
outing
outlaw
overly
owning
oyster
obeyed
oblige
obtuse
occult
octane
octave
oculus
oilers
oldies

See all 323 in the word finder

7-letter words (617)

officer
outside
objects
obvious
offered
opening
operate
opinion
opposed
options
ordered
overall
observe
offense
offices
ongoing
optical
organic
origins
outcome
outdoor
outlets
outlook
obesity
obliged
obscure
odyssey
offence
omitted
onboard
oneself
onwards
optimal
optimum
oranges
orbital
orchard
ottoman
outfits
outline
outrage
outward
overdue
overlap
oversee

See all 617 in the word finder

8-letter words (970)

official
original
occurred
offering
officers
opposite
observed
obsessed
obtained
occasion
occupied
operated
operates
operator
opinions
opponent
opposing
ordering
ordinary
oriented
outcomes
overcome
overseas
overview
objected
observer
obsolete
obstacle
occupies
offences
offended
offender
offenses
offshore
openings
optimism
optional
organise
organism
organize
oriental
orthodox
outbreak
outdated
outdoors

See all 970 in the word finder

9-letter words (922)

obviously
officials
operating
operation
organized
otherwise
ourselves
objective
occasions
offensive
operators
opponents
orchestra
organised
overnight
ownership
obedience
objection
obligated
observers
observing
obsession
obstacles
obtaining
occupying
occurring
offenders
offerings
offspring
operative
oppressed
ordinance
organisms
organizer
originals
outsiders
outskirts
overrated
oversight
overthrow
oblivious
obnoxious
obscurity
observant
obsessive

See all 922 in the word finder

10-letter words (787)

officially
operations
opposition
originally
objectives
obligation
occasional
occupation
objections
occurrence
oppression
optimistic
organizers
organizing
originated
outrageous
overcoming
overlooked
overweight
obligatory
observable
observance
obstetrics
obtainable
oftentimes
operatives
oppressive
optimizing
orchestral
ordinances
ordinarily
ordination
organisers
organising
originates
ornamental
orthopedic
ostensibly
outfielder
outlandish
outpatient
outperform
overloaded
overpriced
overriding

See all 787 in the word finder

11-letter words (589)

opportunity
outstanding
observation
operational
orientation
obligations
observatory
obstruction
overlapping
overlooking
overwhelmed
objectively
objectivity
obliterated
obstructing
occupations
occurrences
officiating
organically
originality
originating
outnumbered
outsourcing
overarching
overcrowded
overflowing
overheating
overpowered
obfuscation
obscenities
observances
obsessively
obstructive
offensively
omnipresent
ontological
opinionated
opportunism
opportunist
optometrist
orchestrate
origination
originators
ornithology
orthography

See all 589 in the word finder

12-letter words (419)

organization
observations
occasionally
organisation
overwhelming
occupational
optimization
orchestrated
overcrowding
overreacting
overshadowed
obsolescence
obstetrician
obstructions
oceanography
optimisation
orientations
orthodontist
oscillations
ostentatious
osteoporosis
otherworldly
outbuildings
outperformed
outrageously
outstretched
overestimate
overpowering
overreaction
overthinking
overthrowing
objectifying
obliterating
obliteration
octogenarian
omnipresence
onomatopoeia
opportunists
oppositional
optometrists
orchestrates
orchestrator
orienteering
originations
orthodontics

See all 419 in the word finder

13-letter words (305)

opportunities
organizations
organisations
objectionable
observational
opportunistic
observatories
obstetricians
oceanographic
operationally
ophthalmology
optimizations
orchestrating
orchestration
ornamentation
overestimated
oceanographer
officeholders
ornithologist
oropharyngeal
osteomyelitis
outmaneuvered
outperforming
outstandingly
overabundance
overconfident
overestimates
overpopulated
overqualified
oversensitive
overshadowing
overstatement
overstretched
overwintering
obliviousness
observability
obsessiveness
octogenarians
offensiveness
oligopolistic
ontologically
optimisations
organogenesis
orientational
orthodontists

See all 305 in the word finder

14-letter words (215)

organizational
overwhelmingly
osteoarthritis
overpopulation
overprotective
obstructionism
obstructionist
optimistically
optoelectronic
orchestrations
organometallic
ornithological
ornithologists
ostentatiously
otolaryngology
overcompensate
overconfidence
overestimating
overestimation
overproduction
oversimplified
oversubscribed
occupationally
oceanographers
onchocerciasis
ophthalmologic
ophthalmoscope
oppositionists
organochlorine
outrageousness
overcomplicate
overcorrection
overemphasized
overindulgence
oversaturation
oversimplifies
overstimulated
oxidoreductase
oystercatchers
obsequiousness
ophthalmoscopy
oppressiveness
ornamentations
ornithischians
orthochromatic

See all 215 in the word finder

15-letter words (159)

objectification
ophthalmologist
oligonucleotide
omnidirectional
optoelectronics
overconsumption
overrepresented
obstructionists
oligodendrocyte
oligomerization
oligosaccharide
organophosphate
overcompensated
overcomplicated
overdevelopment
oversimplifying
overstimulation
observationally
oceanographical
ontogenetically
overachievement
overcompensates
overemphasizing
overgeneralized
overprescribing
oversensitivity
overstimulating
overutilization
overzealousness
oxidoreductases
oxytetracycline
objectivenesses
obliviousnesses
obnoxiousnesses
observabilities
obsessivenesses
obstinatenesses
obstructionisms
obstructiveness
obtainabilities
obtrusivenesses
occidentalizing
odoriferousness
offensivenesses
offhandednesses

See all 159 in the word finder

Darker borders mark common everyday words. Rarer words follow in each group.

Questions

How many words starting with O are there?

Our word list has 5,650 words starting with O. 299 of them are common everyday words.

What is the longest word starting with O?

The longest have 15 letters, for example OBJECTIFICATION, OPHTHALMOLOGIST and OLIGONUCLEOTIDE.

Which word starting with O scores the most points?

Using standard letter tile values, OXYPHENBUTAZONE scores 41 points, the most of any word starting with O in our list.