funrun vs foot race

funrun and foot race both are nouns.

Word	Noun	Adjective	Verb	Adverb
funrun	Yes	No	No	No
foot race	Yes	No	No	No

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

funrun: a footrace run for fun (often including runners who are sponsored for a charity)
foot race: a race run on foot

Other hypernyms of funrun include footrace, run.

funrun (noun)	foot race (noun)
a footrace run for fun (often including runners who are sponsored for a charity)	a race run on foot