A leading role is a pivotal part played by an individual in a performance or an organization. It is a position that carries responsibility, and in some cases, requires a high level of expertise. There are several synonyms for the term leading role, including protagonist, star, mainstay, centerpiece, principal, and key player. All these synonyms emphasize the importance of the position and the person holding it. Whether you are referring to an actor in a movie or a leader in an organization, the concept of a leading role remains central. Knowing these synonyms can help you to describe someone's role more precisely and effectively.