1. Different shapes: A hammer is usually a tool consisting of a handle and a head. The head is thick, spherical or oblate, or other shapes. A hammer is also a tool consisting of a handle and a head. The head is flatter than the hammer, usually rectangular or claw-shaped.
2. Different uses: The main function of the hammer is to knock and hit objects, such as nails and wood, and also to break some smaller objects. The main function of a hammer is to knock and strike objects, especially nails and other objects that can only be inserted or taken out by knocking. Hammerhead has prying force, which can be used to pry open or remove some large objects.