Sistrurus catenatus vs massasauga

Sistrurus catenatus and massasauga both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sistrurus catenatus	Yes	No	No	No
massasauga	Yes	No	No	No

As nouns, Sistrurus catenatus and massasauga are synonyms defined as:

Sistrurus catenatus and massasauga: pygmy rattlesnake found in moist areas from the Great Lakes to Mexico; feeds on mice and small amphibians

Other synonyms of Sistrurus catenatus include massasauga rattler.

Sistrurus catenatus (noun)	massasauga (noun)
pygmy rattlesnake found in moist areas from the Great Lakes to Mexico; feeds on mice and small amphibians	pygmy rattlesnake found in moist areas from the Great Lakes to Mexico; feeds on mice and small amphibians
	small pygmy rattlesnake