Countable Nouns Starting with OR and Containing OS

Browse 14 valid English countable nouns starting with OR and containing OS, from Organophosphate, Organophosphorus, Orthophosphate, Orthosis, Orthros, Ornithomimosaur and Orthosilicate 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 ORB
1 words
orbitosphenoid
Starts with ORG3 words
organophosphate
organophosphorus
organosol
Starts with ORN
2 words
ornithomimosaur
ornithosaur
Starts with ORT8 words
orthophosphate
orthosis
orthros
orthosilicate
orthoscope
orthostat
orthostichy
orthrosanthus

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