There are a few different synonyms that can be used for the phrase "Capital of Tennessee." One of the most popular and commonly used alternatives is simply "Nashville," since this is the city that serves as the capital of the state. However, some other options might include "Tennessean capital," "Music City," or even simply "the state capital." Ultimately, the phrase that you choose to use will depend on context and personal preference, but there are plenty of options out there to choose from when discussing the capital of this southern state.