muddy vs blur

muddy is not a noun while blur is a noun.

Word	Noun	Adjective	Verb	Adverb
muddy	No	Yes	Yes	No
blur	Yes	No	Yes	No

As verbs, blur is a hypernym of muddy; that is, blur is a word with a broader meaning than muddy:

Other hypernyms of muddy include confuse, obnubilate, obscure.

muddy (noun)	blur (noun)
	a hazy or indistinct representation

muddy (adjective)	blur (adjective)
dirty and messy; covered with mud or muck
(of color) discolored by impurities; not bright and clear
(of liquids) clouded as with sediment
(of soil) soft and watery

muddy (verb)	blur (verb)
make turbid	become vague or indistinct
cause to become muddy	make dim or indistinct
dirty with mud	make unclear, indistinct, or blurred
	make a smudge on; soil by smudging
	to make less distinct or clear
	become glassy; lose clear vision