lots vs piles

lots and piles both are nouns.

Word	Noun	Adjective	Verb	Adverb
lots	Yes	No	No	Yes
piles	Yes	No	No	No

As nouns, lots and piles are synonyms defined as:

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

lots (noun)	piles (noun)
a large number or amount	a large number or amount
	venous swelling external or internal to the anal sphincter

lots (adverb)	piles (adverb)
to a very great degree or extent