confirm vs vouch

confirm and vouch both are verbs.

Word	Noun	Adjective	Verb	Adverb
confirm	No	No	Yes	No
vouch	No	No	Yes	No

As verbs, vouch is a hyponym of confirm; that is, vouch is a word with a more specific, narrower meaning than confirm:

Other hyponyms of confirm include back, back up, verify, demonstrate, establish, prove, shew, show, document, validate.

confirm (verb)	vouch (verb)
make more firm	give supporting evidence
establish or strengthen as with new evidence or facts	summon (a vouchee) into court to warrant or defend a title
strengthen or make more firm	give personal assurance; guarantee
administer the rite of confirmation to	give surety or assume responsibility
support a person for a position