mountain blacksnake vs Elaphe obsoleta

mountain blacksnake and Elaphe obsoleta both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain blacksnake	Yes	No	No	No
Elaphe obsoleta	Yes	No	No	No

As nouns, mountain blacksnake and Elaphe obsoleta are synonyms defined as:

mountain blacksnake and Elaphe obsoleta: large harmless shiny black North American snake

Other synonyms of mountain blacksnake include black rat snake, blacksnake, pilot blacksnake.

mountain blacksnake (noun)	Elaphe obsoleta (noun)
large harmless shiny black North American snake	large harmless shiny black North American snake