Countable Nouns That Start with OS and End with R

Explore 7 verified English countable nouns starting with OS and ending with R, including Oscillator, Ostler, Osier, Osmometer, Ostracizer, Ossifier and Ostreodynamometer. 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 OSC
1 words
oscillator
Starts with OSI
1 words
osier
Starts with OSM
1 words
osmometer
Starts with OSS
1 words
ossifier
Starts with OST
3 words
ostler
ostracizer
ostreodynamometer

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