break down vs croak

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

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

break down (noun)	croak (noun)
	a harsh hoarse utterance (as of a frog)

break down (verb)	croak (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	make complaining remarks or noises under one's breath
separate (substances) into constituent elements or parts	utter a hoarse sound, like a raven
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