Refulgency is a word that describes the quality or state of being radiant, bright, and shining. It can be used to describe the brilliance of a sunlit day, the glittering of a diamond, or the sparkling of the ocean. Other words that can be used as synonyms for refulgency include luminosity, radiance, shine, brilliance, splendor, and luster. These words all convey the idea of brightness and excellence, and can be used to describe both physical objects and abstract concepts. Whether you're writing a poem, a novel, or a scientific paper, using synonyms like these can help to add depth and distinction to your prose.