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double chin

lower jaw

upper jaw

submandibular gland

chaetognath (any worm of phylum Chaetognatha)

maxillary prognathism

mandible

Chaetognatha (phylum of arrow worms)

maxilla

agnathans (jawless fishes of superclass Agnatha)

prognathism

chin

jaw joint

maxillary artery

gnathostomiasis

jaw

temporomandibular joint disorder

jawbone

jawbone

maxilliped

chin strap

forktongue goby (Chaenogobius annularis)

(person) with a turned-up chin

to have a protruding chin

cleft chin

suddenly lifting someone's face by their chin (in a domineering yet romantic fashion)

to jerk one's chin

wearing a face mask over one's chin

bearded seal (Erignathus barbatus)

beard (esp. on the chin)