lower jaw vs submaxilla

lower jaw and submaxilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
lower jaw	Yes	No	No	No
submaxilla	Yes	No	No	No

As nouns, lower jaw and submaxilla are synonyms defined as:

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

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

lower jaw (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