pilot blacksnake vs mountain blacksnake

pilot blacksnake and mountain blacksnake both are nouns.

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

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

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

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

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