Is roost a noun

Answer 1

Yes, the word 'roost' is both a noun (roost, roosts) and a verb (roost, roosts, roosting, roosted).

The noun 'roost' is a singular, common, concrete noun, a word for a place where birds regularly settle or congregate to rest at night.

Answer 2

Yes, the word 'rooster' is a noun, a word for an adult male bird of some species; a word for a thing.