exit vs break down

exit is a noun but break down is not a noun.

Word	Noun	Adjective	Verb	Adverb
exit	Yes	No	Yes	No
break down	No	No	Yes	No

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

exit (verb)	break down (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	collapse due to fatigue, an illness, or a sudden attack
lose the lead	stop operating or functioning
move out of or depart from	separate (substances) into constituent elements or parts
	make a mathematical, chemical, or grammatical analysis of; break down into components or essential features
	make ineffective
	cause to fall or collapse
	lose control of one's emotions
	fall apart