7 Letter Countable Nouns Starting with OS

Explore 16 verified English 7 letter countable nouns that start with OS, including Ostrich, Osmosis, Osteoid, Osteria, Ossuary, Ossicle and Osteoma. 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 OSC
1 words
osculum
Starts with OSM4 words
osmosis
osmunda
osmiate
osmerid
Starts with OSS4 words
ossuary
ossicle
ossetra
osselet
Starts with OST7 words
ostrich
osteoid
osteria
osteoma
ostmark
ostiole
ostiary

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