exit vs predecease

exit is a noun but predecease is not a noun.

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

As verbs, predecease is a hyponym of exit; that is, predecease is a word with a more specific, narrower meaning than exit:

exit: pass from physical life and lose all bodily attributes and functions necessary to sustain life
predecease: die before; die earlier than

Other hyponyms of exit include abort, asphyxiate, stifle, suffocate, buy it, pip out, drown, famish, starve, fall, succumb, yield.

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

exit (verb)	predecease (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	die before; die earlier than
lose the lead
move out of or depart from