puma vs cougar

puma and cougar both are nouns.

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

As nouns, puma and cougar are synonyms defined as:

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

puma (noun)	cougar (noun)
large American feline resembling a lion	large American feline resembling a lion