murkiness vs muddiness

murkiness and muddiness both are nouns.

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

As nouns, murkiness and muddiness are synonyms defined as:

Other synonyms of murkiness include cloudiness.

murkiness (noun)	muddiness (noun)
the quality of being cloudy	the quality of being cloudy
an atmosphere in which visibility is reduced because of a cloud of some substance	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