"Vai" is a Portuguese verb meaning "go," and it has a few different synonyms in the language. One option is "ir," which is also a verb meaning "go" and is commonly used in everyday speech. Another synonym for "vai" could be "partir," which translates to "depart" or "leave." This word is often used when referring to a departure or leaving a specific location. A third synonym for "vai" is "caminhar," which means "walk" or "stroll." This is useful when referring to movement on foot, rather than by vehicle. These synonyms allow for variety in language use and can help to better convey meaning in different contexts.