heaps vs stacks

heaps and stacks both are nouns.

Word	Noun	Adjective	Verb	Adverb
heaps	Yes	No	No	Yes
stacks	Yes	No	No	No

As nouns, heaps and stacks are synonyms defined as:

Other synonyms of heaps include dozens, gobs, lashings, loads, lots, oodles, piles, rafts, scads, scores, slews, tons, wads.

heaps (noun)	stacks (noun)
a large number or amount	storage space in a library consisting of an extensive arrangement of bookshelves where most of the books are stored
	a large number or amount

heaps (adverb)	stacks (adverb)
very much