tons vs piles

tons and piles both are nouns.

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

As nouns, tons and piles are synonyms defined as:

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

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