海亀[umigame] sea turtle
亀の子[kamenoko] young turtle (tortoise)
亀の手[kamenote] barnacle
亀鑑[kikan] pattern
亀甲[kikkou] tortoise shell

亀頭[kitou] glans (esp. glans penis)
亀裂[kiretsu] crack
水亀[ishigame] any turtle of the genus Mauremys (esp. the Japanese pond turtle, Mauremys japonica)
盲亀[mouki] blind turtle

内鰐[uchiwani] knock-kneed
鰐口[waniguchi] wide mouth
鰐鮫[wanizame] ferocious shark
鰐皮[wanigawa] crocodile or alligator skin (hide)
鰐足[waniashi] bowlegs

外鰐[sotowani] walking with feet pointing outward
ナイル鰐[nairuwani] Nile crocodile (Crocodylus niloticus)
アメリカ鰐[amerikawani] American crocodile (Crocodylus acutus)
ミシシッピ鰐[mishishippiwani] American alligator (Alligator mississippiensis)