muddiness vs mistiness

muddiness and mistiness both are nouns.

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

As nouns, mistiness is a hyponym of muddiness; that is, mistiness is a word with a more specific, narrower meaning than muddiness:

Other hyponyms of muddiness include turbidity, turbidness, haziness, steaminess, vaporousness, vapourousness.

muddiness (noun)	mistiness (noun)
the quality of being cloudy	cloudiness resulting from haze or mist or vapor
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