lower jaw vs mandibular bone

lower jaw and mandibular bone both are nouns.

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

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

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

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

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