Countable Nouns Starting with O and Containing TI

Explore 242 verified English countable nouns starting with O and containing TI, including Organization, Operation, Option, Objective, Opposition, Observation and Occupation. Browse these count nouns with singular and plural forms below, or review singular and plural count rules in our noun grammar guide.

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Starts with OB24 words
objective
observation
obligation
objection
obstruction
objectification
obliteration
obfuscation
obstinacy
obstructionist
oblation
obscuration
objectivist
obscurantist
obviation
obstipation
objectivation
obturation
objectivization
objurgation
obduction
obtestation
obsoletion
obliquation
Starts with OC13 words
occupation
occultist
occultation
octillion
ocotillo
occidentalization
octapeptide
octastich
ocellation
octillionth
octingentenary
octastichon
octingenary
Starts with OD
2 words
odontist
odonatist
Starts with OF
1 words
officiation
Starts with OI
1 words
oiticica
Starts with OL4 words
oligonucleotide
oligomerization
oligopeptide
olecranarthritis
Starts with OM
2 words
ommatidium
omnipotentiality
Starts with ON6 words
oneirocritic
onomasticon
onomastician
oneirocritics
onychitis
oncogeneticist
Starts with OO
1 words
ootid
Starts with OP24 words
operation
option
opposition
optional
optimization
optics
optimum
operative
optimist
optic
optimizer
optician
optionality
oppositionist
optative
optionee
opsonization
operationalist
optime
opacification
opuntia
optimates
operativity
operationist
Starts with OR21 words
organization
orientation
orchestration
ordination
orthodontist
ornamentation
origination
oration
orthotics
orthotic
orthotist
orthogonalization
orientalization
organotin
orthoptist
oribatid
ornamentist
orthostichy
orchiepididymitis
orontium
orthonectid
Starts with OS12 words
oscillation
ostentation
ossification
ostia
osteomyelitis
ostinato
ostium
osteoarthritic
osculation
ostiole
ostiary
oscitation
Starts with OT
2 words
otosclerotic
otiosity
Starts with OU7 words
outing
outpatient
outie
outstation
outmigration
outpainting
ouistiti
Starts with OV24 words
overtime
ovulation
ovation
overreaction
overestimate
overcorrection
oversimplification
overproduction
overrepresentation
overcompensation
overexertion
overconcentration
overestimation
overactivity
overcomplication
oversensitivity
overgeneralization
overvaluation
overexploitation
overregulation
overspecialization
overmedication
overdetermination
oversubscription
Starts with OX
2 words
oxidation
oxidization
Starts with OZ
2 words
ozonation
ozonization

•Browse Countable Nouns by Letter (A to Z)

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