panther vs catamount

panther and catamount both are nouns.

Word	Noun	Adjective	Verb	Adverb
panther	Yes	No	No	No
catamount	Yes	No	No	No

As nouns, panther and catamount are synonyms defined as:

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

panther (noun)	catamount (noun)
a leopard in the black color phase	large American feline resembling a lion
a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis	short-tailed wildcats with usually tufted ears; valued for their fur
large American feline resembling a lion