Rocky Mountain bighorn vs bighorn

Rocky Mountain bighorn and bighorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rocky Mountain bighorn	Yes	No	No	No
bighorn	Yes	No	No	No

As nouns, Rocky Mountain bighorn and bighorn are synonyms defined as:

Rocky Mountain bighorn and bighorn: wild sheep of mountainous regions of western North America having massive curled horns

Other synonyms of Rocky Mountain bighorn include bighorn sheep, cimarron, Ovis canadensis, Rocky Mountain sheep.

Rocky Mountain bighorn (noun)	bighorn (noun)
wild sheep of mountainous regions of western North America having massive curled horns	wild sheep of mountainous regions of western North America having massive curled horns