blacksnake vs mountain blacksnake

blacksnake and mountain blacksnake both are nouns.

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

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

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

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

blacksnake (noun)	mountain blacksnake (noun)
blackish racer of the eastern United States that grows to six feet	large harmless shiny black North American snake
large harmless shiny black North American snake