Crotalus atrox vs Western diamondback

Crotalus atrox and Western diamondback both are nouns.

Word	Noun	Adjective	Verb	Adverb
Crotalus atrox	Yes	No	No	No
Western diamondback	Yes	No	No	No

As nouns, Crotalus atrox and Western diamondback are synonyms defined as:

Crotalus atrox and Western diamondback: largest and most dangerous North American snake; of southwestern United States and Mexico

Other synonyms of Crotalus atrox include Western diamondback rattlesnake.

Crotalus atrox (noun)	Western diamondback (noun)
largest and most dangerous North American snake; of southwestern United States and Mexico	largest and most dangerous North American snake; of southwestern United States and Mexico