mandibular bone vs lower jawbone

mandibular bone and lower jawbone both are nouns.

Word	Noun	Adjective	Verb	Adverb
mandibular bone	Yes	No	No	No
lower jawbone	Yes	No	No	No

As nouns, mandibular bone and lower jawbone are synonyms defined as:

mandibular bone and lower jawbone: the jaw in vertebrates that is hinged to open the mouth

Other synonyms of mandibular bone include jawbone, jowl, lower jaw, mandible, mandibula, submaxilla.

mandibular bone (noun)	lower jawbone (noun)
the jaw in vertebrates that is hinged to open the mouth	the jaw in vertebrates that is hinged to open the mouth