beleaguer vs dun

beleaguer is not a noun while dun is a noun.

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

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

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

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

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

beleaguer (verb)	dun (verb)
surround so as to force to give up	make a dun color
annoy persistently	cure by salting
	persistently ask for overdue payment
	treat cruelly