wad vs stuff

wad and stuff both are nouns.

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

As nouns, stuff is a hypernym of wad; that is, stuff is a word with a broader meaning than wad:

wad: a small mass of soft material
stuff: the tangible substance that goes into the makeup of a physical object

Other hypernyms of wad include material.

As verbs, stuff is a hypernym of wad; that is, stuff is a word with a broader meaning than wad:

wad (noun)	stuff (noun)
a wad of something chewable as tobacco	miscellaneous unspecified objects
(often followed by `of') a large number or amount or extent	unspecified qualities required to do or be something
a small mass of soft material	a critically important or characteristic component
	senseless talk
	information in some unspecified form
	informal terms for personal possessions
	the tangible substance that goes into the makeup of a physical object

wad (verb)	stuff (verb)
crowd or pack to capacity	fill with a stuffing while cooking
compress into a wad	fill tightly with a material
	treat with grease, fill, and prepare for mounting
	overeat or eat immodestly; make a pig of oneself
	cram into a cavity
	obstruct
	press or force