1. Sky blue is an English word that refers to a shade of blue that is similar to the color of the sky.2. Cerulean is another word that describes a deep, clear blue color, often associated with the sky or the sea.3. Celeste is a term that can refer to the color sky blue, as well as a musical term for a specific type of organ stop.4. Caeruleous is an adjective used to describe a blue color, typically associated with the sky or the sea.