The term 'Hipbone-Related' can be defined by the crossword solution of 'Iliac, ' which is a five-letter word. The iliac bone is a large, flat bone located in the pelvis on either side of the sacrum. It is part of the hipbone, or innominate bone, and is connected to the sacrum posteriorly and the femur laterally. The iliac bone is important for providing stability to the pelvis and lower back, as well as for supporting the weight of the upper body.