rubbish vs scrap

rubbish and scrap both are nouns.

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

As nouns, rubbish and scrap are synonyms defined as:

Other synonyms of rubbish include trash.

rubbish (noun)	scrap (noun)
nonsensical talk or writing	the act of fighting; any contest or struggle
worthless material that is to be disposed of	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

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