'Jaw' generally refers to the mandible, the lower, mobile half of the mouth. The femur is the long bone that forms the thigh.
In your leg.
femer
Submandibular is the medical term meaning under the lower jaw.
Maxillary means pertaining to the upper jaw, or maxilla.
Submandibular is the medical term meaning below the lower jaw, or mandible.
Prognathia is the medical term meaning abnormal forward protrusion of the jaw.
Femer, tibula, toes
femer
Macroagnathia is an abnormally large jaw.
Micrognathia
Speechless, flabbergasted, or nonplussed.
The phenomenon of purposeful mouth movements resulting in involuntary eye closing is often referred to as "jaw winking."