Panthera onca vs panther

Panthera onca and panther both are nouns.

Word	Noun	Adjective	Verb	Adverb
Panthera onca	Yes	No	No	No
panther	Yes	No	No	No

As nouns, Panthera onca and panther are synonyms defined as:

Panthera onca and panther: a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis

Other synonyms of Panthera onca include Felis onca, jaguar.

Panthera onca (noun)	panther (noun)
a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis	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