catamount vs cougar

catamount and cougar both are nouns.

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

As nouns, catamount and cougar are synonyms defined as:

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

catamount (noun)	cougar (noun)
large American feline resembling a lion	large American feline resembling a lion
short-tailed wildcats with usually tufted ears; valued for their fur