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