exit vs leave behind

exit is a noun but leave behind is not a noun.

Word	Noun	Adjective	Verb	Adverb
exit	Yes	No	Yes	No
leave behind	No	No	Yes	No

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

exit (verb)	leave behind (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	be survived by after one's death
lose the lead	leave unchanged or undisturbed or refrain from taking
move out of or depart from	depart and not take along