conk vs break down

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

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

conk (noun)	break down (noun)
informal term for the nose

conk (verb)	break down (verb)
pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain	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
hit, especially on the head	separate (substances) into constituent elements or parts
come to a stop	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