mandibular bone vs submaxilla

mandibular bone and submaxilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
mandibular bone	Yes	No	No	No
submaxilla	Yes	No	No	No

As nouns, mandibular bone and submaxilla are synonyms defined as:

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

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

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