friend vs advocate

friend and advocate both are nouns.

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

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

Other hypernyms of friend include advocator, exponent, proponent.

friend (noun)	advocate (noun)
a person you know well and regard with affection and trust	a person who pleads for a cause or propounds an idea
a person with whom you are acquainted	a lawyer who pleads cases in court
an associate who provides cooperation or assistance
a person who backs a politician or a team etc.

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