broken-down vs derelict

broken-down is not a noun while derelict is a noun.

Word	Noun	Adjective	Verb	Adverb
broken-down	No	Yes	No	No
derelict	Yes	Yes	No	No

As adjectives, broken-down and derelict are synonyms defined as:

Other synonyms of broken-down include bedraggled, dilapidated, ramshackle, tatterdemalion, tumble-down.

broken-down (noun)	derelict (noun)
	a ship abandoned on the high seas
	a person without a home, job, or property

broken-down (adjective)	derelict (adjective)
in deplorable condition	in deplorable condition
not in working order	failing in what duty requires
	forsaken by owner or inhabitants
	worn and broken down by hard use