racer vs beast

racer and beast both are nouns.

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

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

Other hypernyms of racer include animal, animate being, brute, creature, fauna.

racer (noun)	beast (noun)
an animal that races	a living organism characterized by voluntary movement
slender fast-moving North American snakes	a cruelly rapacious person
a fast car that competes in races
someone who drives racing cars at high speeds