THESAURUS
piggy bank
Fort Knox, bank, bursary, cash register, cashbox, chest, coffer, coin box, depository, exchequer, fisc, gold depository, locker, money chest, penny bank, pork barrel, public crib, public till, public treasury, public trough, repository, safe, safe-deposit box, storehouse, strong room, strongbox, subtreasury, till, treasure-house, treasury, vault