friend vs advocator

friend and advocator both are nouns.

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

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

Other hypernyms of friend include advocate, exponent, proponent.

friend (noun)	advocator (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
an associate who provides cooperation or assistance
a person who backs a politician or a team etc.