speedway vs racetrack

speedway and racetrack both are nouns.

Word	Noun	Adjective	Verb	Adverb
speedway	Yes	No	No	No
racetrack	Yes	No	No	No

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

Other hypernyms of speedway include racecourse, raceway, track.

speedway (noun)	racetrack (noun)
a racetrack for racing automobiles or motorcycles	a course over which races are run
road where high speed driving is allowed