What is another word for sky?
Pronunciation: [skˈa͡ɪ] (IPA) 
Sky is a vast expanse of the atmosphere which is above the earth. It is the space that we see when we look above us. Synonyms for the sky include the firmament, celestial sphere, heavens, canopy, blue vault, airspace, and azure. The firmament is a biblical term used to refer to the expanse of the sky. The celestial sphere is the imaginary sphere surrounding the earth, where the stars and other celestial bodies are observed. Canopy refers to the sky viewed through trees while the airspace refers to the area above the ground. Azure refers to the light-blue color of the sky on a clear day. All these synonyms offer an alternative way to describe the sky.
