lower jaw vs jowl

lower jaw and jowl both are nouns.

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

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

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

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

lower jaw (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)