muddiness vs turbidity

muddiness and turbidity both are nouns.

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

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

muddiness: the quality of being cloudy
turbidity: muddiness created by stirring up sediment or having foreign particles suspended

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

muddiness (noun)	turbidity (noun)
the quality of being cloudy	muddiness created by stirring up sediment or having foreign particles suspended
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