mandible vs jowl

mandible and jowl both are nouns.

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

As nouns, mandible and jowl are synonyms defined as:

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

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

mandible (noun)	jowl (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)