black cat vs marten

black cat and marten both are nouns.

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

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

black cat: large dark brown North American arboreal carnivorous mammal
marten: agile slender-bodied arboreal mustelids somewhat larger than weasels

Other hypernyms of black cat include marten cat.

black cat (noun)	marten (noun)
large dark brown North American arboreal carnivorous mammal	agile slender-bodied arboreal mustelids somewhat larger than weasels