racecourse vs velodrome

racecourse and velodrome both are nouns.

Word	Noun	Adjective	Verb	Adverb
racecourse	Yes	No	No	No
velodrome	Yes	No	No	No

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

Other hyponyms of racecourse include cinder track, dirt track, circuit, racing circuit, speedway.

racecourse (noun)	velodrome (noun)
a course over which races are run	a banked oval track for bicycle or motorcycle racing