expire vs exit

expire is not a noun while exit is a noun.

Word	Noun	Adjective	Verb	Adverb
expire	No	No	Yes	No
exit	Yes	No	Yes	No

As verbs, expire and exit are synonyms defined as:

expire and exit: pass from physical life and lose all bodily attributes and functions necessary to sustain life

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

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