Felis concolor vs cougar

Felis concolor and cougar both are nouns.

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

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

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

Felis concolor (noun)	cougar (noun)
large American feline resembling a lion	large American feline resembling a lion