lantern jaw vs jowl

lantern jaw and jowl both are nouns.

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

As nouns, jowl is a hypernym of lantern jaw; that is, jowl is a word with a broader meaning than lantern jaw:

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

lantern jaw (noun)	jowl (noun)
a long thin lower jaw	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)