black racer vs Coluber constrictor

black racer and Coluber constrictor both are nouns.

Word	Noun	Adjective	Verb	Adverb
black racer	Yes	No	No	No
Coluber constrictor	Yes	No	No	No

As nouns, black racer and Coluber constrictor are synonyms defined as:

black racer and Coluber constrictor: blackish racer of the eastern United States that grows to six feet

Other synonyms of black racer include blacksnake.

black racer (noun)	Coluber constrictor (noun)
blackish racer of the eastern United States that grows to six feet	blackish racer of the eastern United States that grows to six feet