fisher vs black cat

fisher and black cat both are nouns.

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

As nouns, fisher and black cat are synonyms defined as:

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

Other synonyms of fisher include fisher cat, Martes pennanti, pekan.

fisher (noun)	black cat (noun)
large dark brown North American arboreal carnivorous mammal	large dark brown North American arboreal carnivorous mammal
someone whose occupation is catching fish