run-up vs approaching

run-up and approaching both are nouns.

Word	Noun	Adjective	Verb	Adverb
run-up	Yes	No	No	No
approaching	Yes	Yes	No	No

As nouns, approaching is a hypernym of run-up; that is, approaching is a word with a broader meaning than run-up:

Other hypernyms of run-up include approach, coming.

run-up (noun)	approaching (noun)
the approach run during which an athlete gathers speed	the act of drawing spatially closer to something
a substantial increase over a relatively short period of time	the temporal property of becoming nearer in time
	the event of one object coming closer to another

run-up (adjective)	approaching (adjective)
	of the relatively near future