muddy vs muddiness

muddy is not a noun while muddiness is a noun.

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

muddy (noun)	muddiness (noun)
	the quality of being cloudy
	a mental state characterized by a lack of clear and orderly thought and behavior
	the wetness of ground that is covered or soaked with water

muddy (adjective)	muddiness (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