Must a joint allow movement between two bones to be called joint?

No. It is not mandatory for a joint to allow movement between two bones to be called a joint. There are three main types of joints in the human body:

1. Synarthrosis joints: These are immovable joints, meaning they do not allow any movement between the bones they connect. Examples of synarthrosis joints include the joints between the bones of the skull and the joints between the teeth and the jawbone.

2. Amphiarthrosis joints: These are slightly movable joints, meaning they allow a small amount of movement between the bones they connect. Examples of amphiarthrosis joints include the joints between the vertebrae of the spine and the joints between the ribs and the sternum.

3. Diarthrosis joints: These are freely movable joints, meaning they allow a wide range of movement between the bones they connect. Examples of diarthrosis joints include the joints of the limbs, such as the knee joint, the hip joint, and the shoulder joint.

So, while many joints do allow movement between two bones, there are also joints that do not allow movement. As long as two bones are connected by a joint, regardless of whether or not it allows movement, it is considered a joint.