upper jaw vs upper jawbone

upper jaw and upper jawbone both are nouns.

Word	Noun	Adjective	Verb	Adverb
upper jaw	Yes	No	No	No
upper jawbone	Yes	No	No	No

As nouns, upper jaw and upper jawbone are synonyms defined as:

upper jaw and upper jawbone: the jaw in vertebrates that is fused to the cranium

Other synonyms of upper jaw include maxilla, maxillary.

upper jaw (noun)	upper jawbone (noun)
the jaw in vertebrates that is fused to the cranium	the jaw in vertebrates that is fused to the cranium