Felis concolor vs panther

Felis concolor and panther both are nouns.

Word	Noun	Adjective	Verb	Adverb
Felis concolor	Yes	No	No	No
panther	Yes	No	No	No

As nouns, Felis concolor and panther are synonyms defined as:

Other synonyms of Felis concolor include catamount, cougar, mountain lion, painter, puma.

Felis concolor (noun)	panther (noun)
large American feline resembling a lion	a leopard in the black color phase
	a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis
	large American feline resembling a lion