jowl vs mandibular bone

jowl and mandibular bone both are nouns.

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

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

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

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

jowl (noun)	mandibular bone (noun)
the jaw in vertebrates that is hinged to open the mouth	the jaw in vertebrates that is hinged to open the mouth
a fullness and looseness of the flesh of the lower cheek and jaw (characteristic of aging)