apparel vs frock

apparel and frock both are nouns.

Word	Noun	Adjective	Verb	Adverb
apparel	Yes	No	Yes	No
frock	Yes	No	Yes	No

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

apparel (noun)	frock (noun)
clothing in general	a one-piece garment for a woman; has skirt and bodice
	a habit worn by clerics
	a long, loose outer garment

apparel (verb)	frock (verb)
provide with clothes or put clothes on	put a frock on