racer vs steeplechaser

racer and steeplechaser both are nouns.

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

As nouns, steeplechaser is a hyponym of racer; that is, steeplechaser is a word with a more specific, narrower meaning than racer:

Other hyponyms of racer include greyhound, finisher.

racer (noun)	steeplechaser (noun)
an animal that races	a horse trained to run in steeplechases
slender fast-moving North American snakes
a fast car that competes in races
someone who drives racing cars at high speeds