beef up vs confirm

beef up and confirm both are verbs.

Word	Noun	Adjective	Verb	Adverb
beef up	No	No	Yes	No
confirm	No	No	Yes	No

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

beef up (verb)	confirm (verb)
make strong or stronger	make more firm
	establish or strengthen as with new evidence or facts
	strengthen or make more firm
	administer the rite of confirmation to
	support a person for a position