Illustration showing the basic parts of a hip. The Illiac Crest is the part the normal person calls a hip - for instance when a person puts their hands on their hips. The pelvis is the lower structure located at the base of the spine. The femoral head is at the top of the femur bone.

The Acetabulum is the cup like indent in the hip where the femur head bone joins the hip and pivots.

 

Additional References about Hips:

Hips at Wikipedia

Hip Bones at Stanford University

Hip Bones University of Glasgow

Bones and Muscles of the Hip by Dartmouth College