Countable Nouns Starting with OP and Containing O

This list gathers 168 English countable nouns starting with OP and containing O, such as Open, Operation, Opportunity, Opinion, Option, Opening and Opposition. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.

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Starts with OP
1 words
op
Starts with OPA9 words
opaque
opacity
opal
opa
opaline
opacifier
opah
opacification
opaleye
Starts with OPC
1 words
opcode
Starts with OPE24 words
open
operation
opening
operator
opera
opener
operative
operetta
operand
operant
opencast
operon
operculum
openwork
openside
operagoer
operatorship
opercular
operationalist
operativity
operationist
operettist
operosity
opercule
Starts with OPH24 words
ophthalmologist
ophthalmoscope
ophidian
ophidiophobia
ophthalmoscopy
ophiolite
ophrys
ophidiophobic
ophthalmist
ophthalmoplegia
ophidiophile
ophite
ophiologist
ophidiophobe
ophiura
ophiurid
ophthalmometer
ophicleide
ophthalmometry
ophites
ophiuroid
ophiopogon
ophiophilist
ophthalmoscopist
Starts with OPI18 words
opinion
opioid
opiate
opinionator
opinionist
opisthosoma
opisthotonos
opinicus
opisthobranch
opifex
opisthograph
opisometer
opisthography
opisthodomos
opisthopulmonate
opisthobranchiate
opificer
opisthocoelian
Starts with OPO6 words
opossum
opoponax
opobalsam
opodeldoc
opopanax
oporice
Starts with OPP22 words
opportunity
opposite
opposition
opponent
oppression
oppressor
opportunist
opposer
oppo
oppositionist
oppidum
oppugnancy
opponency
opponens
oppugner
oppidan
oppugnant
oppilation
oppilative
oppilant
oppignoration
oppigneration
Starts with OPS7 words
opsin
opsonization
opsimath
opsonification
opsiometer
opsonium
opsomaniac
Starts with OPT24 words
option
optional
optimization
optics
optimum
optimist
optic
optimizer
optician
optometrist
optionality
optative
optionee
optant
opter
optime
optocoupler
optimates
optimate
optometer
optophone
opticist
optologist
optomeninx
Starts with OPU5 words
opus
opuntia
opuscule
opusculum
opulus

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