communist vs advocate

communist and advocate both are nouns.

Word	Noun	Adjective	Verb	Adverb
communist	Yes	Yes	No	No
advocate	Yes	No	Yes	No

As nouns, advocate is a hypernym of communist; that is, advocate is a word with a broader meaning than communist:

Other hypernyms of communist include advocator, exponent, proponent.

communist (noun)	advocate (noun)
a socialist who advocates communism	a person who pleads for a cause or propounds an idea
	a lawyer who pleads cases in court

communist (adjective)	advocate (adjective)
relating to or marked by communism

communist (verb)	advocate (verb)
	push for something
	speak, plead, or argue in favor of