murkiness vs turbidness

murkiness and turbidness both are nouns.

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

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

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

Other hyponyms of murkiness include turbidity, haziness, mistiness, steaminess, vaporousness, vapourousness.

murkiness (noun)	turbidness (noun)
the quality of being cloudy	muddiness created by stirring up sediment or having foreign particles suspended
an atmosphere in which visibility is reduced because of a cloud of some substance