call for vs request

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

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

As verbs, request is a hypernym of call for; that is, request is a word with a broader meaning than call for:

Other hypernyms of call for include ask for, bespeak, call for, quest.

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

Other synonyms of call for include ask for, bespeak, quest.

call for (noun)	request (noun)
	the verbal act of requesting
	a formal message requesting something that is submitted to an authority

call for (verb)	request (verb)
request the participation or presence of	express the need or desire for
express the need or desire for	ask (a person) to do something
gather or collect	inquire for (information)
require as useful, just, or proper