break down vs exit

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

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

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

break down (verb)	exit (verb)
collapse due to fatigue, an illness, or a sudden attack	pass from physical life and lose all bodily attributes and functions necessary to sustain life
stop operating or functioning	lose the lead
separate (substances) into constituent elements or parts	move out of or depart from
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