request vs say

request and say both are nouns.

Word	Noun	Adjective	Verb	Adverb
request	Yes	No	Yes	No
say	Yes	No	Yes	No

As verbs, say is a hyponym of request; that is, say is a word with a more specific, narrower meaning than request:

Other hyponyms of request include enjoin, order, tell, call, bid, invite, declare oneself, offer, pop the question, propose.

request (noun)	say (noun)
the verbal act of requesting	the chance to speak
a formal message requesting something that is submitted to an authority

request (verb)	say (verb)
express the need or desire for	express in words
ask (a person) to do something	report or maintain
inquire for (information)	speak, pronounce, or utter in a certain way
	express a supposition
	give instructions to or direct somebody to do something with authority
	communicate or express nonverbally
	recite or repeat a fixed text
	indicate
	state as one's opinion or judgement; declare
	utter aloud
	have or contain a certain wording or form