The leg bone or femur is a crucial part of the human skeleton. There are several synonyms for the word femur such as thighbone, thigh bone, and upper leg bone. Another synonym for the femur is the longest and strongest bone in the human body. Being a weight-bearing bone, some other synonyms include the bone that supports the body, the bone that connects the hip and the knee, and the bone that gives the leg structure. Furthermore, slang terms like the leg stick and the leg hammer are also used as synonyms for femur or leg bone. Regardless of the word used, the femur plays a critical role in the overall function of the body.