"Bye" is a commonly used term of farewell, but sometimes you may need to switch it up and use a different phrase to avoid sounding repetitive. Fortunately, there are plenty of synonyms to choose from. "Farewell," "adios," "so long," "cheerio," and "au revoir" are a few examples of formal farewells. For a more casual tone, you could use "see ya," "later," "catch you later," or "peace out." Friends may use goofy phrases like "toodle-oo," "ciao for now," or "hasta luego." Regardless of the synonym you choose, make sure it aligns with the context and relationship with the person you're saying goodbye to.