hurdle vs hurdling

hurdle and hurdling both are nouns.

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

hurdle (noun)	hurdling (noun)
the act of jumping over an obstacle	a footrace in which contestants must negotiate a series of hurdles
a light movable barrier that competitors must leap over in certain races
an obstacle that you are expected to overcome

hurdle (verb)	hurdling (verb)
jump a hurdle