Countable Nouns Starting with OP and Containing TI

Browse 35 valid English countable nouns starting with OP and containing TI, from Operation, Option, Opposition, Optional, Optimization, Optics and Optimum 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
1 words
opacification
Starts with OPE6 words
operation
operative
operationalist
operativity
operationist
operettist
Starts with OPH3 words
ophthalmomyositis
ophthalmoneuritis
ophthalmodiastimeter
Starts with OPP6 words
opposition
oppositionist
oppilation
oppilative
oppignoration
oppigneration
Starts with OPS
2 words
opsonization
opsonification
Starts with OPT16 words
option
optional
optimization
optics
optimum
optimist
optic
optimizer
optician
optionality
optative
optionee
optime
optimates
optimate
opticist
Starts with OPU
1 words
opuntia

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