advocator vs proponent

advocator and proponent both are nouns.

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

As nouns, advocator and proponent are synonyms defined as:

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

Other synonyms of advocator include advocate, exponent.

advocator (noun)	proponent (noun)
a person who pleads for a cause or propounds an idea	a person who pleads for a cause or propounds an idea