Countable Nouns Starting with OP and Containing A

Explore 91 verified English countable nouns starting with OP and containing A, including Operation, Operator, Opera, Optional, Optimization, Opaque and Operative. 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 OPA
9 words
opaque
opacity
opal
opa
opaline
opacifier
opah
opacification
opaleye
Starts with OPE
15 words
operation
operator
opera
operative
operetta
operand
operant
opencast
operagoer
operatorship
opercular
operationalist
operativity
operationist
operatrix
Starts with OPH
24 words
ophthalmologist
ophthalmoscope
ophidian
ophidiophobia
ophthalmoscopy
ophthalmist
ophthalmoplegia
ophiura
ophthalmometer
ophthalmometry
ophthalmoscopist
ophiuran
ophthalmomycosis
ophicalcite
ophthalmodynamometer
ophthalmostatometer
ophthalmodiagnosis
ophthalmothermometer
ophthalmencephalon
ophiolater
ophthalmomyositis
ophthalmoneuritis
ophidiarium
ophthalmocarcinoma
Starts with OPI
9 words
opiate
opinionator
opisthosoma
opisthobranch
opisthograph
opisthography
opisthopulmonate
opisthobranchiate
opisthocoelian
Starts with OPO
3 words
opoponax
opobalsam
opopanax
Starts with OPP
8 words
oppugnancy
oppidan
oppugnant
oppilation
oppilative
oppilant
oppignoration
oppigneration
Starts with OPS
4 words
opsonization
opsimath
opsonification
opsomaniac
Starts with OPT
8 words
optional
optimization
optician
optionality
optative
optant
optimates
optimate
Starts with OPU
1 words
opuntia

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