Is close a common noun

Answer 1

No, the word 'closed' is the pastparticiple past tense of the verb to close (closes, closing, closed). The past participle of the verb is also an adjective (a closedbook).

Answer 2

Yes, the noun 'close' is a common noun, a general word for the end of an activity, event, or period of time; the end of a days' trading on a Stock Market; the shutting of something, such as a door; a general word for a thing.

The word 'close' is also a verb, an adjective, and an adverb.

Answer 3

Yes