call for vs postulate

call for is not a noun while postulate is a noun.

Word	Noun	Adjective	Verb	Adverb
call for	No	No	Yes	No
postulate	Yes	No	Yes	No

As verbs, call for and postulate are synonyms defined as:

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

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

call for (verb)	postulate (verb)
request the participation or presence of	take as a given; assume as a postulate or axiom
express the need or desire for	maintain or assert
gather or collect	require as useful, just, or proper
require as useful, just, or proper