garbage heap vs junk heap

garbage heap and junk heap both are nouns.

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

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

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

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

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