require vs say

require is not a noun while say is a noun.

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

As verbs, say is a hypernym of require; that is, say is a word with a broader meaning than require:

Other hypernyms of require include enjoin, order, tell.

require (noun)	say (noun)
	the chance to speak

require (verb)	say (verb)
make someone do something	express in words
consider obligatory; request and expect	report or maintain
have need of	speak, pronounce, or utter in a certain way
require as useful, just, or proper	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