exit vs succumb

exit is a noun but succumb is not a noun.

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

As verbs, succumb is a hyponym of exit; that is, succumb 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
succumb: be fatally overwhelmed

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

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

exit (verb)	succumb (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	consent reluctantly
lose the lead	be fatally overwhelmed
move out of or depart from