pilot blacksnake vs Elaphe obsoleta

pilot blacksnake and Elaphe obsoleta both are nouns.

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

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

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

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

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