marten cat vs mustelid

marten cat and mustelid both are nouns.

Word	Noun	Adjective	Verb	Adverb
marten cat	Yes	No	No	No
mustelid	Yes	No	No	No

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

marten cat: agile slender-bodied arboreal mustelids somewhat larger than weasels
mustelid: fissiped fur-bearing carnivorous mammals

Other hypernyms of marten cat include musteline, musteline mammal.

marten cat (noun)	mustelid (noun)
agile slender-bodied arboreal mustelids somewhat larger than weasels	fissiped fur-bearing carnivorous mammals