beset vs dun

beset is not a noun while dun is a noun.

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

As verbs, dun is a hyponym of beset; that is, dun is a word with a more specific, narrower meaning than beset:

Other hyponyms of beset include goad, needle, bedevil, crucify, frustrate, rag, torment, haze.

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

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

beset (verb)	dun (verb)
assail or attack on all sides:	make a dun color
decorate or cover lavishly (as with gems)	cure by salting
annoy continually or chronically	persistently ask for overdue payment
	treat cruelly