Elaphe obsoleta vs mountain blacksnake

Elaphe obsoleta and mountain blacksnake both are nouns.

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

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

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

Other synonyms of Elaphe obsoleta include black rat snake, blacksnake, pilot blacksnake.

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