junk heap vs trash heap

junk heap and trash heap both are nouns.

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

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

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

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

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