black cat vs Martes pennanti

black cat and Martes pennanti both are nouns.

Word	Noun	Adjective	Verb	Adverb
black cat	Yes	No	No	No
Martes pennanti	Yes	No	No	No

As nouns, black cat and Martes pennanti are synonyms defined as:

black cat and Martes pennanti: large dark brown North American arboreal carnivorous mammal

Other synonyms of black cat include fisher, fisher cat, pekan.

black cat (noun)	Martes pennanti (noun)
large dark brown North American arboreal carnivorous mammal	large dark brown North American arboreal carnivorous mammal