御湯[oyu] hot water
塩湯[shioyu] hot salt water (incl. bath)
温湯[ontou] comfortably hot bath
下湯[shimoyu] sitz bath
そと湯[sotoyu] open air bath (in an inn, onsen, etc.)

給湯[kyuutou] hot-water supply
給湯器[kyuutouki] hot-water heater
腰湯[koshiyu] sitting bath
重湯[omoyu] thin rice gruel
出で湯[ideyu] hot spring

貯める[tameru] to save (i.e. in a bank)
貯金[chokin] (bank) savings
貯金通帳[chokintsuuchou] bank book
貯金箱[chokinbako] savings box
貯水[chosui] storage of water

貯水池[chosuichi] reservoir
貯蔵[chozou] storage
貯蔵タンク[chozoutanku] storage tank
定額貯金[teigakuchokin] fixed amount (postal) savings
備荒貯蓄[bikouchochiku] famine-relief fund