The term 'Horse Part' can be broken down into two solutions: HOOF (4 letters) and MANE (4 letters). A HOOF is the hard, protective covering of the horse's foot, which is made up of a thick, horny material. The HOOF helps the horse to walk and run on different surfaces. The MANE is the long hair that grows along the horse's neck and back. It is usually made up of coarse hairs and is used to protect the horse from the elements.