declare vs say

declare is not a noun while say is a noun.

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

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

Other hypernyms of declare include state, tell.

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

Other hypernyms of declare include state, tell.

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

Other hypernyms of declare include state, tell.

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

declare (verb)	say (verb)
state emphatically and authoritatively	express in words
state firmly	report or maintain
make a declaration (of dutiable goods) to a customs official	speak, pronounce, or utter in a certain way
declare to be	express a supposition
announce publicly or officially	give instructions to or direct somebody to do something with authority
proclaim one's support, sympathy, or opinion for or against	communicate or express nonverbally
designate (a trump suit or no-trump) with the final bid of a hand	recite or repeat a fixed text
authorize payments of	indicate
	state as one's opinion or judgement; declare
	utter aloud
	have or contain a certain wording or form