junk vs rubble

junk and rubble both are nouns.

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

As nouns, junk and rubble are synonyms defined as:

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

Other synonyms of junk include debris, detritus, dust.

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

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