hurdling vs track event

hurdling and track event both are nouns.

Word	Noun	Adjective	Verb	Adverb
hurdling	Yes	No	No	No
track event	Yes	No	No	No

As nouns, track event is a hypernym of hurdling; that is, track event is a word with a broader meaning than hurdling:

hurdling: a footrace in which contestants must negotiate a series of hurdles
track event: a footrace performed on a track (indoor or outdoor)

hurdling (noun)	track event (noun)
a footrace in which contestants must negotiate a series of hurdles	a footrace performed on a track (indoor or outdoor)