scrap vs rubble

scrap and rubble both are nouns.

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

As nouns, rubble is a hyponym of scrap; that is, rubble is a word with a more specific, narrower meaning than scrap:

Other hyponyms of scrap include scrap metal, debris, detritus, dust, junk, litter.

scrap (noun)	rubble (noun)
the act of fighting; any contest or struggle	the remains of something that has been destroyed or broken up
a small piece of something that is left over after the rest has been used
a small fragment of something broken off from the whole
worthless material that is to be disposed of

scrap (verb)	rubble (verb)
make into scrap or refuse
have a disagreement over something
dispose of (something useless or old)