Mother Hubbard vs frock

Mother Hubbard and frock both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mother Hubbard	Yes	No	No	No
frock	Yes	No	Yes	No

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

Other hypernyms of Mother Hubbard include dress.

Mother Hubbard (noun)	frock (noun)
a woman's loose unbelted dress	a one-piece garment for a woman; has skirt and bodice
	a habit worn by clerics
	a long, loose outer garment

Mother Hubbard (verb)	frock (verb)
	put a frock on