strapless vs frock

strapless and frock both are nouns.

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

As nouns, frock is a hypernym of strapless; that is, frock is a word with a broader meaning than strapless:

strapless: a woman's garment that exposes the shoulders and has no shoulder straps
frock: a one-piece garment for a woman; has skirt and bodice

Other hypernyms of strapless include dress.

strapless (noun)	frock (noun)
a woman's garment that exposes the shoulders and has no shoulder straps	a one-piece garment for a woman; has skirt and bodice
	a habit worn by clerics
	a long, loose outer garment

strapless (adjective)	frock (adjective)
having no straps

strapless (verb)	frock (verb)
	put a frock on