piles vs scads

piles and scads both are nouns.

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

As nouns, piles and scads are synonyms defined as:

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

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