Femur and Hip joint

Femur noun - The longest and thickest bone of the human skeleton; extends from the pelvis to the knee.

Hip joint and femur are semantically related. In some cases you can use "Hip joint" instead a noun "Femur".

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

Femur and hip joint are semantically related. You can use "Femur" instead a noun phrase "Hip joint".