certify vs certificate

certify is not a noun while certificate is a noun.

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

certify (noun)	certificate (noun)
	a document attesting to the truth of certain stated facts
	a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends

certify (verb)	certificate (verb)
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes	authorize by certificate
declare legally insane	present someone with a certificate
guarantee payment on; of checks
guarantee as meeting a certain standard
authorize officially