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

瓜二つ[urifutatsu] as alike as two melons (two peas in a pod)
天糸瓜[hechima] sponge gourd
水瓜[suika] watermelon
破瓜[haka] age 16 (girl)
破瓜病[hakabyou] hebephrenia (disorganized schizophrenia) (disorganised)

木瓜[boke] (Chinese) flowering quince
南瓜[kabocha] pumpkin
黄瓜[kyuuri] cucumber
天瓜粉[tenkafun] talcum powder