dun vs hassle

dun and hassle both are nouns.

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

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

Other hypernyms of dun include beset, chevvy, chevy, chivvy, chivy, harass, harry, molest, plague, provoke.

dun (noun)	hassle (noun)
horse of a dull brownish grey color	disorderly fighting
a color or pigment varying around a light grey-brown color	an angry disturbance

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

dun (verb)	hassle (verb)
make a dun color	annoy continually or chronically
cure by salting
persistently ask for overdue payment
treat cruelly