junk pile vs scrapheap

junk pile and scrapheap both are nouns.

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

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

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

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