certify vs bear witness

certify and bear witness both are verbs.

Word	Noun	Adjective	Verb	Adverb
certify	No	No	Yes	No
bear witness	No	No	Yes	No

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

certify: provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
bear witness: provide evidence for

Other hypernyms of certify include evidence, prove, show, testify.

certify (verb)	bear witness (verb)
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes	give testimony in a court of law
declare legally insane	provide evidence for
guarantee payment on; of checks
guarantee as meeting a certain standard
authorize officially