advocate vs advocator

advocate and advocator both are nouns.

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

As nouns, advocate and advocator are synonyms defined as:

advocate and advocator: a person who pleads for a cause or propounds an idea

Other synonyms of advocate include exponent, proponent.

advocate (noun)	advocator (noun)
a person who pleads for a cause or propounds an idea	a person who pleads for a cause or propounds an idea
a lawyer who pleads cases in court

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