muddiness vs state of mind

muddiness and state of mind both are nouns.

Word	Noun	Adjective	Verb	Adverb
muddiness	Yes	No	No	No
state of mind	Yes	No	No	No

As nouns, state of mind is a hypernym of muddiness; that is, state of mind is a word with a broader meaning than muddiness:

muddiness: a mental state characterized by a lack of clear and orderly thought and behavior
state of mind: the state of a person's cognitive processes

Other hypernyms of muddiness include cognitive state.

muddiness (noun)	state of mind (noun)
the quality of being cloudy	the state of a person's cognitive processes
a mental state characterized by a lack of clear and orderly thought and behavior	a temporary psychological state
the wetness of ground that is covered or soaked with water