wad vs heap

wad and heap both are nouns.

Word	Noun	Adjective	Verb	Adverb
wad	Yes	No	Yes	No
heap	Yes	No	Yes	No

As nouns, wad and heap are synonyms defined as:

wad and heap: (often followed by `of') a large number or amount or extent

wad (noun)	heap (noun)
a wad of something chewable as tobacco	a car that is old and unreliable
(often followed by `of') a large number or amount or extent	a collection of objects laid on top of each other
a small mass of soft material	(often followed by `of') a large number or amount or extent