The word mandator refers to someone who has the power or authority to issue commands or orders. Some synonyms for this word include controller, commander, ruler, director, boss, supervisor, overseer, governor, and manager. Each of these words has a slightly different connotation, ranging from someone who is in charge of a specific function or department to someone who has overall control and authority. Depending on the context in which the word is being used, one of these synonyms may be more appropriate than another. However, they all share the common theme of being in a position of power and authority.