Question

What is the function of an adjective?

to name a person, place, thing, or idea

to modify a verb, adverb, or another adjective

to express action

to modify a noun or pronoun

Answer 1

The function of an adjective is simply to modify a noun or pronoun. They do not modify verbs, adjectives, or adverbs. And the first one, which names a person, place, or thing, is called a noun. To express action is called a verb.
Good luck!