Countable Nouns Starting with O and Containing T
Explore 1,064 verified English countable nouns starting with O and containing T, including Organization, Operation, Opportunity, Object, Option, Objective and Outcome. 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 OA7 words
oath
oatmeal
oat
oast
oater
oatcake
oasthouse
Starts with OB24 words
object
objective
observation
obligation
obstacle
objection
obstruction
obscurity
obituary
observatory
obscenity
objector
objectification
obliteration
obfuscation
obstetrician
obstinacy
observability
obstructionist
obit
oblast
oblate
oblation
obscuration
Starts with OC24 words
occupation
occupant
octopus
octave
octagon
octane
oceanfront
octet
octogenarian
ocelot
occultist
occidental
occipital
octavo
octahedron
occultation
oculist
octuple
octant
oculomotor
octuplet
octothorp
occiput
octillion
Starts with OD24 words
oddity
oddment
odorant
odontoid
odist
odontoblast
odonate
odontocete
odontoma
odontologist
odontalgia
odontolite
odontophore
odontograph
odontist
odontophobia
odontalgic
odontornithes
odonatologist
odontoglossum
odonatist
odontography
odontophoran
odontopteryx
Starts with OE7 words
oersted
oenologist
oedometer
oenothera
oenophilist
oecist
oenometer
Starts with OF16 words
offset
offshoot
offbeat
officiant
offertory
offtake
officemate
offput
offcut
officiator
officiality
officiation
offprint
offcutter
offcast
officialty
Starts with OG
1 words oghamist
Starts with OH
1 words ohmmeter
Starts with OI7 words
ointment
oilcloth
oilstone
oikist
oilnut
oillet
oiticica
Starts with OK
1 words okta
Starts with OL24 words
olfactory
oldster
oligonucleotide
oliphant
oligodendrocyte
ologist
oligomerization
oligopeptide
oligopolist
oleate
olinguito
oleaster
olfact
olivet
oligochaete
oleothorax
olfactologist
olivenite
olfactometer
oligist
olitory
olecranarthritis
olfactophobia
oleorefractometer
Starts with OM14 words
omelet
omnipotent
omniscient
omentum
ommatidium
ombrometer
omittance
omitter
omphacite
ommateum
omoplate
ommatophore
omnipotentiality
omentosplenopexy
Starts with ON24 words
onset
ontology
onslaught
oncologist
onomatopoeia
ontogeny
ontologist
onanist
onbeat
onglet
onomatopoiesis
ontake
oncost
oneirocritic
onomasticon
onsetter
onychocryptosis
ondatra
onomatologist
onomastician
oneirocritics
onychitis
onomast
onocentaur
Starts with OO16 words
oocyte
oocyst
oolite
oophorectomy
ootheca
oologist
oont
oophorosalpingectomy
ootid
oophyte
oomycete
oolith
oophorhysterectomy
oophorocystectomy
oogamete
oobit
Starts with OP24 words
operation
opportunity
option
opposite
opposition
opponent
operator
optional
optimization
optics
optimum
operative
opacity
optimist
opiate
optic
opportunist
optimizer
optician
optometrist
ophthalmologist
operetta
optionality
operant
Starts with OR24 words
organization
orientation
orbit
orchestra
orthodox
originality
ornament
orient
oriental
orbital
ornamental
orthodoxy
orchestration
orator
ordination
orthodontist
organist
ornamentation
oratory
origination
oration
originator
orbiter
orthography
Starts with OS24 words
ostrich
oscillation
oscillator
ostracism
ostentation
ostomy
osteopathy
osteopath
ossification
ostler
osmolarity
osteosarcoma
osteoid
osteria
ostia
osteonecrosis
osteocyte
osteomyelitis
osteotomy
osmolality
osmanthus
ostinato
ostomate
ostium
Starts with OT24 words
other
ottoman
otter
otto
othering
otaku
otherworld
otoscope
ottawan
oto
otolith
otorhinolaryngologist
otoplasty
otologist
otoscopy
ottavino
otalgia
ottava
otocinclus
otarine
otterhound
otosclerotic
otary
otiosity
Starts with OU24 words
out
outside
ought
outcome
output
outer
outline
outfit
outlet
outlook
outrage
outsider
outreach
outbreak
outward
outgoing
outlaw
outage
outing
outskirts
outset
outcast
outpatient
outpost
Starts with OV24 words
overnight
oversight
overtime
overthrow
overturn
overture
overcast
overcoat
ovulation
overwrite
ovation
overreaction
overpayment
overshoot
overestimate
overdraft
overtone
overstatement
overstay
overstock
overthinker
overgrowth
overcorrection
oversimplification
Starts with OW
2 words owlet
owelty
Starts with OX22 words
oxidation
oximeter
oxtail
oxidant
oxalate
oxidization
oxcart
oxygenator
oxheart
oxtongue
oxaloacetate
oxytetracycline
oxter
oxidoreductase
oxytocic
oxytone
oxytonic
oxysalt
oxypetalum
oxgate
oxyanthraquinone
oxytrope
Starts with OY4 words
oyster
oystercatcher
oysterman
oysterer
Starts with OZ4 words
ozonation
ozonization
ozothamnus
ozokerite