Is pebble an adjective

Answer 1

No, the word 'pebbles' is both a noun (pebble, pebbles) and a verb (pebble, pebbles, pebbling, pebbled).

The noun 'pebbles' is the plural form of the singular noun 'pebble'; a word for a small, rounded stone that has been smoothed by flowing water or sand; a word for a thing.

The verb 'pebbles' is the third person, singular, present of the verb to pebble; meaning to pelt with small rounded stones; to pave or cover with small rounded stones; to make a surface similar to a surface of small rounded stones.

The adjective forms of the verb to pebble are pebbled and pebbling.

Answer 2

It can be.