Felis onca vs Panthera onca

Felis onca and Panthera onca both are nouns.

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

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

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

Other synonyms of Felis onca include jaguar, panther.

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