trash pile vs junk heap

trash pile and junk heap both are nouns.

Word	Noun	Adjective	Verb	Adverb
trash pile	Yes	No	No	No
junk heap	Yes	No	No	No

As nouns, trash pile and junk heap are synonyms defined as:

trash pile and junk heap: an accumulation of refuse and discarded matter

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

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