fog vs murkiness

fog and murkiness both are nouns.

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

As nouns, fog and murkiness are synonyms defined as:

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

Other synonyms of fog include fogginess, murk.

fog (noun)	murkiness (noun)
confusion characterized by lack of clarity	the quality of being cloudy
droplets of water vapor suspended in the air near the ground	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

fog (verb)	murkiness (verb)
make less visible or unclear