murkiness vs murk

murkiness and murk both are nouns.

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

As nouns, murkiness and murk are synonyms defined as:

murkiness and murk: an atmosphere in which visibility is reduced because of a cloud of some substance

Other synonyms of murkiness include fog, fogginess.

murkiness (noun)	murk (noun)
the quality of being cloudy	an atmosphere in which visibility is reduced because of a cloud of some substance
an atmosphere in which visibility is reduced because of a cloud of some substance

murkiness (verb)	murk (verb)
	make dark, dim, or gloomy