A bishop coadjutor is a bishop who is elected to succeed the current bishop upon their retirement or resignation. However, there are several synonyms for this term, including suffragan bishop, assistant bishop, and auxiliary bishop. These titles all refer to a bishop who works closely with and assists a diocesan bishop in their duties. Other related terms include coadjutor archbishop, who assists the archbishop of a metropolitan diocese, and metropolitan bishop, who oversees a province of several dioceses. Regardless of title, all of these bishops play an important role in supporting and leading the Catholic Church.