14 Letter Countable Nouns Starting with OP

Browse 7 valid English 14 letter countable nouns that start with OP, from Ophthalmoscope, Ophthalmoscopy, Operationalist, Ophthalmometer, Ophthalmometry, Opsonification and Opisthocoelian 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 OPE
1 words
operationalist
Starts with OPH4 words
ophthalmoscope
ophthalmoscopy
ophthalmometer
ophthalmometry
Starts with OPI
1 words
opisthocoelian
Starts with OPS
1 words
opsonification

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