The word "most stelliform" refers to something that is star-shaped or resembling a star. Some synonyms for this word include stellar, astral, celestial, sidereal, and galactic. Each of these words has a similar connotation of something related to the stars or the universe. Other possible synonyms include radiating, luminous, sparkling, and gleaming. These words all describe something that is bright and shining, similar to the way that stars shine in the night sky. Whether describing a physical object or an abstract concept, these synonyms can help to add depth and nuance to your writing by using more specific and evocative language.