fogbank vs fog

fogbank and fog both are nouns.

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

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

fogbank (noun)	fog (noun)
a large mass of fog on the sea (as seen from a distance)	confusion characterized by lack of clarity
	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

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