10 Letter Countable Nouns Starting with OS

Explore 18 verified English 10 letter countable nouns that start with OS, including Oscillator, Osteopathy, Osmolarity, Osmolality, Osteoblast, Osteoclast and Osculation. 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 OSC5 words
oscillator
osculation
osculatory
oscitation
osculatrix
Starts with OSM6 words
osmolarity
osmolality
osmophobia
osmiridium
osmophobic
osmeterium
Starts with OST7 words
osteopathy
osteoblast
osteoclast
osteophyte
ostracizer
ostracodan
ostrowskia

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