悪水[akusui] undrinkable water
井戸水[idomizu] well water
一衣帯水[ichiitaisui] (being separated only by a) narrow strip of water
一水[issui] current (of water)
溢水[issui] inundation

飲水量[insuiryou] amount of drinking
飲料水[inryousui] drinking water
烏の行水[karasunogyouzui] quick bath
雲水[unsui] itinerant priest
塩化水素[enkasuiso] hydrogen chloride

水黽[amenbo] pond skater (any insect of family Gerridae)
黽勉[binben] industry

蛙黽[abou] tree frog (toad)
塩水黽[shioamenbo] Asclepios shiranui (species of pond skater)