rubble vs junk

rubble and junk both are nouns.

Word	Noun	Adjective	Verb	Adverb
rubble	Yes	No	No	No
junk	Yes	No	Yes	No

As nouns, rubble and junk are synonyms defined as:

rubble and junk: the remains of something that has been destroyed or broken up

Other synonyms of rubble include debris, detritus, dust.

rubble (noun)	junk (noun)
the remains of something that has been destroyed or broken up	any of various Chinese boats with a high poop and lugsails
	the remains of something that has been destroyed or broken up

rubble (verb)	junk (verb)
	dispose of (something useless or old)