fog vs murk

fog and murk both are nouns.

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

As nouns, fog and murk are synonyms defined as:

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

Other synonyms of fog include fogginess, murkiness.

fog (noun)	murk (noun)
confusion characterized by lack of clarity	an atmosphere in which visibility is reduced because of a cloud of some substance
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

fog (verb)	murk (verb)
make less visible or unclear	make dark, dim, or gloomy