In the sentence, "He is the athlete who has won many competitions," the word "who" is a ____?

In the sentence, "He is the athlete who has won many competitions," the word "who" is a ____?

Explanation

He is the athlete who has won many competitions," the word "who" is a relative pronoun.

"Who" is a relative pronoun.

It is used to introduce a clause providing more information about "the athlete."