What is another word for "cloud"?

Roget's Thesaurus (1911) lists these synonyms for "cloud": abditory, adytum, aeration, aerial, aerification, aeriform, aerodynamics, aerography, aerology, aerometer, aerometry, aeronaut, aeronautics, aeroscope, aeroscopy, aerosphere, aerostatics, aerostation, affiance, air, airy, alkali, ambuscade, ambush, ammonia, ammoniacal, anchor, and, aneroid, anticipation, aspiration, assumption, assurance, atmosphere, atmospheric, awning, back, background, balm, barometer.