dirt track vs racetrack

dirt track and racetrack both are nouns.

Word	Noun	Adjective	Verb	Adverb
dirt track	Yes	No	No	No
racetrack	Yes	No	No	No

As nouns, racetrack is a hypernym of dirt track; that is, racetrack is a word with a broader meaning than dirt track:

Other hypernyms of dirt track include racecourse, raceway, track.

dirt track (noun)	racetrack (noun)
a racetrack that is not paved	a course over which races are run