lower jawbone vs mandibular bone

lower jawbone and mandibular bone both are nouns.

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

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

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

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

lower jawbone (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