certify vs declare

certify and declare both are verbs.

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

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

Other hypernyms of certify include adjudge, hold.

certify (verb)	declare (verb)
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes	state emphatically and authoritatively
declare legally insane	state firmly
guarantee payment on; of checks	make a declaration (of dutiable goods) to a customs official
guarantee as meeting a certain standard	declare to be
authorize officially	announce publicly or officially
	proclaim one's support, sympathy, or opinion for or against
	designate (a trump suit or no-trump) with the final bid of a hand
	authorize payments of