下顎[kagaku] lower jaw
二重顎[nijuuago] double chin
顎骨[agobone] jawbone
上顎[uwaago] upper jaw
顎紐[agohimo] chin strap

顎ひげ[agohige] beard (esp. on the chin)
下顎骨[kagakukotsu] mandible
顎関節[gakukansetsu] jaw joint
顎で使う[agodetsukau] to set somebody to work in an arrogant fashion

鬚髯[shuzen] mustache and beard
口鬚[kuchihige] moustache
顎鬚[agohige] beard (esp. on the chin)
虎鬚[torahige] bristly beard or mustache
鬚を生やす[higewohayasu] to grow a beard

巻鬚[makihige] tendril
顎鬚海豹[agohigeazarashi] bearded seal (Erignathus barbatus)
鯨鬚[kujirahige] whalebone
鬚鯨[higekujira] baleen whale