mandible vs submaxilla

mandible and submaxilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
mandible	Yes	No	No	No
submaxilla	Yes	No	No	No

As nouns, mandible and submaxilla are synonyms defined as:

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

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

mandible (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