obstacle race vs footrace

obstacle race and footrace both are nouns.

Word	Noun	Adjective	Verb	Adverb
obstacle race	Yes	No	No	No
footrace	Yes	No	No	No

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

Other hypernyms of obstacle race include foot race, run.

obstacle race (noun)	footrace (noun)
a race in which competitors must negotiate obstacles	a race run on foot