hurdling vs hurdles

hurdling and hurdles both are nouns.

Word	Noun	Adjective	Verb	Adverb
hurdling	Yes	No	No	No
hurdles	Yes	No	No	No

As nouns, hurdling and hurdles are synonyms defined as:

hurdling and hurdles: a footrace in which contestants must negotiate a series of hurdles

Other synonyms of hurdling include hurdle race.

hurdling (noun)	hurdles (noun)
a footrace in which contestants must negotiate a series of hurdles	a footrace in which contestants must negotiate a series of hurdles