overshadow vs fog

overshadow is not a noun while fog is a noun.

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

As verbs, fog is a hypernym of overshadow; that is, fog is a word with a broader meaning than overshadow:

Other hypernyms of overshadow include becloud, befog, cloud, haze over, mist, obnubilate, obscure.

overshadow (noun)	fog (noun)
	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

overshadow (verb)	fog (verb)
cast a shadow upon	make less visible or unclear
be greater in significance than
make appear small by comparison