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

ちょび髭[chobihige] small mustache
天神髭[tenjinhige] goatee
八字髭[hachijihige] finely-trimmed moustache
鼻髭[hanahige] moustache
髭剃り[higesori] shaving

不精髭[bushouhige] stubble
付け髭[tsukehige] false moustache
頬髭[hoohige] whiskers
鯰髭[namazuhige] drooping moustache