reaching vs arrival

reaching and arrival both are nouns.

Word	Noun	Adjective	Verb	Adverb
reaching	Yes	No	No	No
arrival	Yes	No	No	No

As nouns, reaching and arrival are synonyms defined as:

reaching (noun)	arrival (noun)
accomplishment of an objective	accomplishment of an objective
the act of physically reaching or thrusting out	the act of arriving at a certain place
	someone who arrives (or has arrived)