submaxilla vs lower jaw

submaxilla and lower jaw both are nouns.

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

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

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

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

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