Countable Nouns That Start with OP and End with TER

Explore 12 verified English countable nouns starting with OP and ending with TER, including Opter, Optometer, Ophthalmometer, Opisometer, Ophthalmodynamometer, Ophthalmostatometer and Ophthalmothermometer. Sort these count nouns with singular and plural forms by word length for ESL grammar practice, determiner usage, and plural spelling below, or review singular and plural count rules in our noun grammar guide.

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Starts with OPH
8 words
ophthalmometer
ophthalmodynamometer
ophthalmostatometer
ophthalmothermometer
ophiolater
ophthalmotonometer
ophthalmotropometer
ophthalmodiastimeter
Starts with OPI
1 words
opisometer
Starts with OPS
1 words
opsiometer
Starts with OPT
2 words
opter
optometer

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