marten vs mustelid

marten and mustelid both are nouns.

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

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

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

Other hypernyms of marten include musteline, musteline mammal.

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