Mellifluent is an elegant word that describes sweet or smooth-sounding speech. If you're looking for synonyms for this word to spice up your writing, you might consider using words like mellifluous, dulcet, harmonious, melodic, musical, euphonious, sonorous, or soothing. Each of these words has its own unique flavor and subtleties, so it's important to choose the one that best fits the tone and context of your writing. Ultimately, however, all of these words share the same root essence of flowing and satisfying sound, making them excellent choices for when you want to describe someone's voice as pleasing to the ear.