junk pile vs dump

junk pile and dump both are nouns.

Word	Noun	Adjective	Verb	Adverb
junk pile	Yes	No	No	No
dump	Yes	No	Yes	No

As nouns, dump is a hypernym of junk pile; that is, dump is a word with a broader meaning than junk pile:

Other hypernyms of junk pile include dumpsite, garbage dump, rubbish dump, trash dump, waste-yard, wasteyard.

junk pile (noun)	dump (noun)
an accumulation of refuse and discarded matter	a place where supplies can be stored
	(computer science) a copy of the contents of a computer storage device; sometimes used in debugging programs
	a piece of land where waste materials are dumped
	a coarse term for defecation

junk pile (verb)	dump (verb)
	knock down with force
	drop (stuff) in a heap or mass
	fall abruptly
	throw away as refuse
	sell at artificially low prices
	sever all ties with, usually unceremoniously or irresponsibly