exit vs suffocate

exit is a noun but suffocate is not a noun.

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

As verbs, suffocate is a hyponym of exit; that is, suffocate 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
suffocate: be asphyxiated; die from lack of oxygen

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

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

exit (verb)	suffocate (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	struggle for breath; have insufficient oxygen intake
lose the lead	feel uncomfortable for lack of fresh air
move out of or depart from	be asphyxiated; die from lack of oxygen
	suppress the development, creativity, or imagination of
	become stultified, suppressed, or stifled
	deprive of oxygen and prevent from breathing
	impair the respiration of or obstruct the air passage of