fitch vs mustelid

fitch and mustelid both are nouns.

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

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

fitch: dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened
mustelid: fissiped fur-bearing carnivorous mammals

Other hypernyms of fitch include musteline, musteline mammal.

fitch (noun)	mustelid (noun)
dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened	fissiped fur-bearing carnivorous mammals