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

だぼ鯊[dabohaze] goby (fish)
真鯊[mahaze] yellowfin goby (Acanthogobius flavimanus)
顎鯊[agohaze] forktongue goby (Chaenogobius annularis)
糸引鯊[itohikihaze] Myersina filifer (species of goby)

洞鯊[urohaze] Glossogobius olivaceus (species of goby)
極楽鯊[gokurakuhaze] barcheek goby (Rhinogobius giurinus)
跳鯊[tobihaze] mudskipper (Periophthalmus cantonensis)
蚯蚓鯊[mimizuhaze] flat-headed goby (Luciogobius guttatus)