Nouns

(n)fogdroplets of water vapor suspended in the air near the ground
(n)fog, fogginess, murk, murkinessan atmosphere in which visibility is reduced because of a cloud of some substance
(n)daze, fog, hazeconfusion characterized by lack of clarity

Verbs

(v)obscure, befog, becloud, obnubilate, haze over, fog, cloud, mistmake less visible or unclear“The stars are obscured by the clouds”, “the big elm tree obscures our view of the valley”