racetrack vs speedway

racetrack and speedway both are nouns.

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

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

Other hyponyms of racetrack include cinder track, dirt track, circuit, racing circuit, velodrome.

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