junk pile vs garbage heap

junk pile and garbage heap both are nouns.

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

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

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

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

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