throw away vs scrap

throw away is not a noun while scrap is a noun.

Word	Noun	Adjective	Verb	Adverb
throw away	No	No	Yes	No
scrap	Yes	No	Yes	No

As verbs, scrap is a hyponym of throw away; that is, scrap is a word with a more specific, narrower meaning than throw away:

throw away (noun)	scrap (noun)
	the act of fighting; any contest or struggle
	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

throw away (verb)	scrap (verb)
to remove	make into scrap or refuse
throw or cast away	have a disagreement over something
	dispose of (something useless or old)