貯水 （チョスイ） storage of water

貯金 （チョキン） putting money aside, savings, deposit (e.g. in a bank), accumulated surplus of wins, wins in the bank

郵貯 （ユウチョ） postal (post-office) savings (deposit)

貯める （ためる） to save up (money)

蓄える （たくわえる） to store, to save up, to stock up on, to lay in stock, to set aside, to accumulate (e.g. knowledge), to build up (e.g. experience), to develop (e.g. one's skills), to grow (a beard, moustache, etc.), to wear