Countable Nouns Starting with OP and Containing N

Browse 65 valid English countable nouns starting with OP and containing N, from Open, Operation, Opportunity, Opinion, Option, Opening and Opposition to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to review singular and plural count rules.

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Starts with OPA
2 words
opaline
opacification
Starts with OPE12 words
open
operation
opening
opener
operand
operant
opencast
operon
openwork
openside
operationalist
operationist
Starts with OPH9 words
ophidian
ophiopogon
ophiuran
ophthalmodynamometer
ophthalmodiagnosis
ophthalmencephalon
ophthalmoneuritis
ophthalmocarcinoma
ophthalmotonometer
Starts with OPI9 words
opinion
opinionator
opinionist
opisthotonos
opinicus
opisthobranch
opisthopulmonate
opisthobranchiate
opisthocoelian
Starts with OPO
2 words
opoponax
opopanax
Starts with OPP16 words
opportunity
opposition
opponent
oppression
opportunist
oppositionist
oppugnancy
opponency
opponens
oppugner
oppidan
oppugnant
oppilation
oppilant
oppignoration
oppigneration
Starts with OPS5 words
opsin
opsonization
opsonification
opsonium
opsomaniac
Starts with OPT9 words
option
optional
optimization
optician
optionality
optionee
optant
optophone
optomeninx
Starts with OPU
1 words
opuntia

•Browse Countable Nouns by Letter (A to Z)

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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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