mandibular bone vs lower jaw

mandibular bone and lower jaw both are nouns.

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

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

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

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

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