fug vs murk

fug and murk both are nouns.

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

As nouns, murk is a hypernym of fug; that is, murk is a word with a broader meaning than fug:

fug: (British informal) an airless smoky smelly atmosphere
murk: an atmosphere in which visibility is reduced because of a cloud of some substance

Other hypernyms of fug include fog, fogginess, murkiness.

fug (noun)	murk (noun)
(British informal) an airless smoky smelly atmosphere	an atmosphere in which visibility is reduced because of a cloud of some substance

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