The term 'Cathedral Part' refers to the three main parts of a cathedral: the Apsis (5 letters), APSE (4 letters), and NAVE (4 letters). The Apsis is the semicircular area at the end of the church, usually containing the altar. The APSE is the curved wall that forms the Apsis. The NAVE is the main body of the church, typically extending from the entrance to the Apsis. Together, these three parts form the core of a cathedral.