scrapheap vs junk heap

scrapheap and junk heap both are nouns.

Word	Noun	Adjective	Verb	Adverb
scrapheap	Yes	No	No	No
junk heap	Yes	No	No	No

As nouns, scrapheap and junk heap are synonyms defined as:

Other synonyms of scrapheap include garbage heap, junk pile, refuse heap, rubbish heap, trash heap, trash pile.

scrapheap (noun)	junk heap (noun)
pile of discarded metal	an accumulation of refuse and discarded matter
an accumulation of refuse and discarded matter