certify vs endorse

certify and endorse both are verbs.

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

As verbs, certify and endorse are synonyms defined as:

Other synonyms of certify include indorse.

certify (verb)	endorse (verb)
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes	sign as evidence of legal transfer
declare legally insane	be behind; approve of
guarantee payment on; of checks	guarantee as meeting a certain standard
guarantee as meeting a certain standard	give support or one's approval to
authorize officially