scrap vs scrap metal

scrap and scrap metal both are nouns.

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

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

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

scrap (noun)	scrap metal (noun)
the act of fighting; any contest or struggle	discarded metal suitable for reprocessing
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)	scrap metal (verb)
make into scrap or refuse
have a disagreement over something
dispose of (something useless or old)