protagonist vs advocate

protagonist and advocate both are nouns.

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

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

Other hypernyms of protagonist include advocator, exponent, proponent.

protagonist (noun)	advocate (noun)
a person who backs a politician or a team etc.	a person who pleads for a cause or propounds an idea
the principal character in a work of fiction	a lawyer who pleads cases in court

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