heap vs wad

heap and wad both are nouns.

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

As nouns, heap and wad are synonyms defined as:

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

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