Thraco-Phrygian is a term used to describe a specific group of people who are believed to have lived in ancient times. This group is often associated with the areas of Thrace and Phrygia, which were located in what is now modern-day Turkey. While there aren't necessarily synonyms for the term Thraco-Phrygian itself, there are other terms that can be used to describe similar groups of people. For example, the term Anatolian refers to people who lived in the Anatolian region of Turkey, which also includes Thrace and Phrygia. Another term that may be used is Indo-European, which is a broader term that refers to a larger group of people who are believed to have lived in Europe and Asia during ancient times.