pacesetter vs race horse

pacesetter and race horse both are nouns.

Word	Noun	Adjective	Verb	Adverb
pacesetter	Yes	No	No	No
race horse	Yes	No	No	No

As nouns, race horse is a hypernym of pacesetter; that is, race horse is a word with a broader meaning than pacesetter:

Other hypernyms of pacesetter include bangtail, racehorse.

pacesetter (noun)	race horse (noun)
a horse used to set the pace in racing	a horse bred for racing
a leading instance in its field