proponent vs advocator

proponent and advocator both are nouns.

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

As nouns, proponent and advocator are synonyms defined as:

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

Other synonyms of proponent include advocate, exponent.

proponent (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