weasel vs mustelid

weasel and mustelid both are nouns.

Word	Noun	Adjective	Verb	Adverb
weasel	Yes	No	No	No
mustelid	Yes	No	No	No

As nouns, mustelid is a hypernym of weasel; that is, mustelid is a word with a broader meaning than weasel:

weasel: small carnivorous mammal with short legs and elongated body and neck
mustelid: fissiped fur-bearing carnivorous mammals

Other hypernyms of weasel include musteline, musteline mammal.

weasel (noun)	mustelid (noun)
small carnivorous mammal with short legs and elongated body and neck	fissiped fur-bearing carnivorous mammals
a person who is regarded as treacherous or sneaky