going away vs exit

going away and exit both are nouns.

Word	Noun	Adjective	Verb	Adverb
going away	Yes	No	No	No
exit	Yes	No	Yes	No

As nouns, exit is a hyponym of going away; that is, exit is a word with a more specific, narrower meaning than going away:

going away (noun)	exit (noun)
the act of departing	the act of going out
	an opening that permits escape or release
	euphemistic expressions for death

going away (verb)	exit (verb)
	pass from physical life and lose all bodily attributes and functions necessary to sustain life
	lose the lead
	move out of or depart from