Play word 水雲 水雲 もずく mozuku (Cladosiphon okamuranus and Sphaerotrichia divaricata, types of edible seaweed)
Play word 水亀 水亀 いしがめ any turtle of the genus Mauremys (esp. the Japanese pond turtle, Mauremys japonica)
Play word 水琴窟 水琴窟 すいきんくつ buried earthen jar that makes sound when water drips into it (garden feature)