Question

is black is an adjective

Answer 1

ya black is a adjective black also a colour

Answer 2

Black is an adjective. It can be used in multiple forms to describe a sentence, as an adjective is a describing word.

For instance, if I say he was carrying a black umbrella, this describes that the umbrella was black.

Similarly, if I say that the girl had black hair, it proves that black is a describing word that describes the hair color of the girl.