sheath vs frock

sheath and frock both are nouns.

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

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

Other hypernyms of sheath include dress.

sheath (noun)	frock (noun)
a protective covering (as for a knife or sword)	a one-piece garment for a woman; has skirt and bodice
a dress suitable for formal occasions	a habit worn by clerics
an enveloping structure or covering enclosing an animal or plant organ or part	a long, loose outer garment

sheath (verb)	frock (verb)
	put a frock on