ask vs postulate

ask is not a noun while postulate is a noun.

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

As verbs, ask and postulate are synonyms defined as:

Other synonyms of ask include call for, demand, involve, necessitate, need, require, take.

ask (noun)	postulate (noun)
	(logic) a proposition that is accepted as true in order to provide a basis for logical reasoning

ask (verb)	postulate (verb)
make a request or demand for something to somebody	take as a given; assume as a postulate or axiom
direct or put; seek an answer to	maintain or assert
address a question to and expect an answer from	require as useful, just, or proper
consider obligatory; request and expect
require or ask for as a price or condition
make a date
require as useful, just, or proper