fitch vs musteline

fitch and musteline both are nouns.

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

As nouns, musteline is a hypernym of fitch; that is, musteline 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
musteline: fissiped fur-bearing carnivorous mammals

Other hypernyms of fitch include mustelid, musteline mammal.

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