mistiness vs cloudiness

mistiness and cloudiness both are nouns.

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

As nouns, cloudiness is a hypernym of mistiness; that is, cloudiness is a word with a broader meaning than mistiness:

Other hypernyms of mistiness include muddiness, murkiness.

mistiness (noun)	cloudiness (noun)
cloudiness resulting from haze or mist or vapor	the quality of being cloudy
	the state of the sky when it is covered by clouds
	gloomy semidarkness caused by cloud cover