fog vs mental confusion

fog and mental confusion both are nouns.

Word	Noun	Adjective	Verb	Adverb
fog	Yes	No	Yes	No
mental confusion	Yes	No	No	No

As nouns, mental confusion is a hypernym of fog; that is, mental confusion is a word with a broader meaning than fog:

fog: confusion characterized by lack of clarity
mental confusion: a mental state characterized by a lack of clear and orderly thought and behavior

Other hypernyms of fog include confusedness, confusion, disarray, muddiness.

fog (noun)	mental confusion (noun)
confusion characterized by lack of clarity	a mental state characterized by a lack of clear and orderly thought and behavior
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)	mental confusion (verb)
make less visible or unclear