frock vs apparel

frock and apparel both are nouns.

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

As verbs, apparel is a hypernym of frock; that is, apparel is a word with a broader meaning than frock:

Other hypernyms of frock include clothe, dress, enclothe, fit out, garb, garment, habilitate, raiment, tog.

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

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