madden vs dun

madden is not a noun while dun is a noun.

Word	Noun	Adjective	Verb	Adverb
madden	No	No	Yes	No
dun	Yes	Yes	Yes	No

As verbs, dun is a hypernym of madden; that is, dun is a word with a broader meaning than madden:

Other hypernyms of madden include bedevil, crucify, frustrate, rag, torment.

madden (noun)	dun (noun)
	horse of a dull brownish grey color
	a color or pigment varying around a light grey-brown color

madden (adjective)	dun (adjective)
	of a dull greyish brown to brownish grey color

madden (verb)	dun (verb)
make mad	make a dun color
drive up the wall; go on someone's nerves	cure by salting
cause to go crazy; cause to lose one's mind	persistently ask for overdue payment
	treat cruelly