bighorn sheep vs bighorn

bighorn sheep and bighorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
bighorn sheep	Yes	No	No	No
bighorn	Yes	No	No	No

As nouns, bighorn sheep and bighorn are synonyms defined as:

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

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

bighorn sheep (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