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

蘚苔[sentai] moss
光蘚[hikarigoke] luminous moss
蘚苔学[sentaigaku] bryology
蘚苔植物[sentaishokubutsu] bryophyte (any of three groups of non-vascular land plants, inc. mosses, hornworts and liverworts)

水蘚[mizugoke] sphagnum
蘚類[senrui] mosses (non-vascular plants of class Bryopsida)
高野の万年蘚[kouyanomannengoke] Climacium japonicum (species of moss)