vouch vs confirm

vouch and confirm both are verbs.

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

As verbs, confirm is a hypernym of vouch; that is, confirm is a word with a broader meaning than vouch:

Other hypernyms of vouch include affirm, corroborate, substantiate, support, sustain.

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