postulator vs postulate

postulator and postulate both are nouns.

Word	Noun	Adjective	Verb	Adverb
postulator	Yes	No	No	No
postulate	Yes	No	Yes	No

postulator (noun)	postulate (noun)
someone who assumes or takes something for granted as the basis of an argument	(logic) a proposition that is accepted as true in order to provide a basis for logical reasoning
(Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization

postulator (verb)	postulate (verb)
	take as a given; assume as a postulate or axiom
	maintain or assert
	require as useful, just, or proper