mountain lion vs catamount

mountain lion and catamount both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain lion	Yes	No	No	No
catamount	Yes	No	No	No

As nouns, mountain lion and catamount are synonyms defined as:

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

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