refuse heap vs junk pile

refuse heap and junk pile both are nouns.

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

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

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

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

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