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

虻蜂取らず[abuhachitorazu] attempting two tasks simultaneously, accomplishing neither
花虻[hanaabu] hoverfly (any fly of family Syrphidae)
盲虻[mekuraabu] deerfly (Chrysops suavis)
馬虻[umaabu] horse botfly
食虫虻[mushihikiabu] robber fly (any fly of family Asilidae)

長吻虻[tsuriabu] bee fly (any insect of family Bombyliidae)
牛虻[ushiabu] Tabanus trigonus (species of horsefly)
赤牛虻[akaushiabu] Tabanus chrysurus (species of horsefly)
水虻[mizuabu] soldier fly (any fly of family Stratiomyidae, esp. species Stratiomys japonica)