There are several synonyms for the term "head of the department." One of the most common is "department chair," which is often used in academic settings. In the business world, "department manager" or "division manager" can be used, while in government contexts, "minister" or "secretary" could be alternatives. Other options include "supervisor," "chief," "director," or "leader" depending on the specific circumstances. Choosing the right synonym depends on the context, industry and level of authority of the individual holding the role. Regardless of the term, the head of the department is responsible for ensuring its smooth and efficient operation.