outer garment vs frock

outer garment and frock both are nouns.

Word	Noun	Adjective	Verb	Adverb
outer garment	Yes	No	No	No
frock	Yes	No	Yes	No

As nouns, frock is a hyponym of outer garment; that is, frock is a word with a more specific, narrower meaning than outer garment:

Other hyponyms of outer garment include aba, cloak, coat, izar, snowsuit.

outer garment (noun)	frock (noun)
a garment worn over other garments	a one-piece garment for a woman; has skirt and bodice
	a habit worn by clerics
	a long, loose outer garment

outer garment (verb)	frock (verb)
	put a frock on