approaching vs timing

approaching and timing both are nouns.

Word	Noun	Adjective	Verb	Adverb
approaching	Yes	Yes	No	No
timing	Yes	No	No	No

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

approaching (noun)	timing (noun)
the act of drawing spatially closer to something	the regulation of occurrence, pace, or coordination to achieve a desired effect (as in music, theater, athletics, mechanics)
the temporal property of becoming nearer in time	the time when something happens
the event of one object coming closer to another

approaching (adjective)	timing (adjective)
of the relatively near future