atmosphere vs murkiness

atmosphere and murkiness both are nouns.

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

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

atmosphere: the weather or climate at some place
murkiness: an atmosphere in which visibility is reduced because of a cloud of some substance

Other hyponyms of atmosphere include air mass, anticyclone, cyclone, fog, fogginess, murk.

atmosphere (noun)	murkiness (noun)
a distinctive but intangible quality surrounding a person or thing	the quality of being cloudy
the mass of air surrounding the Earth	an atmosphere in which visibility is reduced because of a cloud of some substance
the envelope of gases surrounding any celestial body
a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
the weather or climate at some place
a particular environment or surrounding influence