Abstract Nouns That Start with O

Explore 1,235 verified English abstract nouns starting with O, including Old, Open, Order, Office, Okay, Organization and Offer. Browse these idea words for emotions, qualities, and intangible concepts by length below, or explore examples of abstract vs. concrete nouns in our noun grammar guide.

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Starts with OA5 words
oath
oasis
oafishness
oarsmanship
oakiness
Starts with OB24 words
object
objective
observation
obligation
obstacle
objection
obsession
obedience
obesity
objectivity
obstruction
obscurity
observable
observance
obscenity
oblivion
obstetrics
obsolescence
objectification
obliteration
obfuscation
obstinacy
obe
obviousness
Starts with OC24 words
ocean
occasion
occupation
occurrence
occupancy
occult
octave
octane
oceanography
octet
occultism
occlusion
octal
ocher
occam
occultation
octuple
octillion
ochlocracy
occidentalism
occasionalism
octennial
occidentalization
occupance
Starts with OD24 words
odd
odds
odor
odyssey
ode
oddity
oddness
odium
odontology
odometry
od
odal
odiousness
odontalgia
odorousness
odonatology
odontophobia
odyle
odoriferousness
odism
odontogeny
odontography
odylism
odorimetry
Starts with OE4 words
oersted
oenophily
oenomania
oenomancy
Starts with OF24 words
off
office
offer
offense
offensive
offering
offset
offseason
offside
offshoot
offbeat
offshoring
offramp
offertory
officialdom
offensiveness
offing
offtake
offput
officiousness
offspin
officiality
officiation
officialese
Starts with OG4 words
ogle
ogham
ogreism
ogrism
Starts with OH3 words
oh
ohm
ohmage
Starts with OI3 words
oi
oiliness
oinology
Starts with OK4 words
ok
okay
okeydoke
okta
Starts with OL24 words
old
olympics
oligarchy
olfactory
olympus
oligopoly
oldness
olympiad
oligocene
olfaction
ology
oligomerization
oldspeak
oliguria
oligopsony
oligospermia
oligotrophy
olfact
oligemia
olericulture
olfactology
olfactometry
oligophagy
olfactronics
Starts with OM24 words
omission
omen
omega
om
omnipotence
ombre
omniscience
omerta
omnipresence
omnishambles
ominousness
omnivory
omnisexuality
omnibenevolence
omnicide
omnicompetence
omphaloskepsis
omnivorousness
omittance
omophagy
omphalitis
omophagia
omniana
omphalophlebitis
Starts with ON24 words
one
once
ongoing
onset
onboarding
ontology
onslaught
oncology
oncoming
onus
oneness
onomatopoeia
onrush
ontogeny
onshoring
onomastics
onanism
ongoingness
oncogenesis
ontogenesis
oncogenicity
onbeat
onomatopoiesis
onerousness
Starts with OO14 words
ooh
oops
oomph
oop
oodles
oogenesis
oompah
oology
ooziness
oophoritis
oogamy
oogeny
oophorocystectomy
oofiness
Starts with OP24 words
open
operation
opportunity
opinion
option
operating
opening
opposite
opposition
opera
optional
optimization
optimism
oppression
openness
optics
op
optimum
opener
opacity
opium
opiate
opus
ophthalmology
Starts with OR24 words
order
organization
ordinary
origin
orientation
organism
orbit
originality
oracle
orgasm
ornament
orient
ordeal
orbital
orthodoxy
ordinance
orthopedics
orgy
orchestration
orphanage
ordination
ordinal
origami
ornamentation
Starts with OS24 words
osteoporosis
osmosis
oscillation
osteoarthritis
ostracism
ostentation
ostomy
osteopathy
ossification
osmolarity
osteonecrosis
osteogenesis
osmolality
osteology
osmose
ostinato
osmoregulation
osteolysis
osteomalacia
ostentatiousness
osculation
osteoarthrosis
osteopetrosis
ostent
Starts with OT16 words
other
otherness
othering
otitis
otherworld
otherworldliness
otolaryngology
otosclerosis
ototoxicity
otherwhere
otology
ottava
ottocento
otiosity
otioseness
otohemineurasthenia
Starts with OU24 words
out
ought
outcome
output
outline
outlet
outlook
outrage
ounce
outreach
outbreak
outward
outgoing
ouch
outage
outing
outsourcing
outset
outburst
outcry
outflow
outlier
outro
ouster
Starts with OV24 words
overnight
overview
overwhelm
overhead
oversight
overtime
overweight
overdose
override
overlap
overflow
overthrow
overturn
overload
overlay
overhaul
overture
overrun
overhang
overuse
ovulation
overkill
overriding
overwrite
Starts with OW7 words
ownership
owt
owlishness
owling
ownsome
owelty
owerloup
Starts with OX10 words
oxidation
oxymoron
oxygenation
oxidization
oxblood
oximetry
oxidimetry
oxyuriasis
oxycephaly
oxgate
Starts with OY
2 words
oyez
oyer
Starts with OZ3 words
ozonation
ozonolysis
ozonization

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