black-footed ferret vs mustelid

black-footed ferret and mustelid both are nouns.

Word	Noun	Adjective	Verb	Adverb
black-footed ferret	Yes	No	No	No
mustelid	Yes	No	No	No

As nouns, mustelid is a hypernym of black-footed ferret; that is, mustelid is a word with a broader meaning than black-footed ferret:

black-footed ferret: musteline mammal of prairie regions of United States; nearly extinct
mustelid: fissiped fur-bearing carnivorous mammals

Other hypernyms of black-footed ferret include musteline, musteline mammal.

black-footed ferret (noun)	mustelid (noun)
musteline mammal of prairie regions of United States; nearly extinct	fissiped fur-bearing carnivorous mammals