blacksnake vs racer

blacksnake and racer both are nouns.

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

As nouns, racer is a hypernym of blacksnake; that is, racer is a word with a broader meaning than blacksnake:

blacksnake: blackish racer of the eastern United States that grows to six feet
racer: slender fast-moving North American snakes

blacksnake (noun)	racer (noun)
blackish racer of the eastern United States that grows to six feet	an animal that races
large harmless shiny black North American snake	slender fast-moving North American snakes
	a fast car that competes in races
	someone who drives racing cars at high speeds