Sistrurus miliaris vs massasauga

Sistrurus miliaris and massasauga both are nouns.

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

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

Other synonyms of Sistrurus miliaris include ground rattler.

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