Stellular is an adjective that is used to describe something that is covered with or composed of stars. However, there are various other synonyms to refer to stellular things that we use in everyday language. Astral is the most common synonym used when we refer to starry objects or celestial phenomena. Stellar is another word that we commonly use to describe anything that is shining or radiating light like a star. Moreover, other synonyms of stellular include celestial, heavenly, sky-bound, and cosmic. All of these synonyms express the idea of something related to the stars, sky, or the universe. They can be used interchangeably based on the context in which you are using them.