The lower jawbone is scientifically known as the mandible. However, there are a few synonyms that can be used to describe it. One of the most common is 'jawbone.' This term is often used in casual conversation and is the easiest to understand. Another synonym that can be used is 'mandibular bone.' This is the more formal term for the lower jaw. 'Mandible' is also commonly used in medical settings. Other synonyms include 'lower jaw,' 'lower jawbone,' 'inferior maxillary bone,' and 'submaxilla.' No matter which synonym you use, they all refer to the same bone that is essential for eating, speaking, and facial structure.