Hip joint and Spheroid joint

Hip joint noun - The ball-and-socket joint between the head of the femur and the acetabulum.

Spheroid joint and hip joint are semantically related. In some cases you can use "Spheroid joint" instead a noun phrase "Hip joint".

Spheroid joint noun - A freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone.

Hip joint and spheroid joint are semantically related. Sometimes you can replace phrase "Hip joint" with "Spheroid joint", this phrases are similar.