bank vault(n = noun.artifact) vault - a strongroom or compartment (often made of steel) for safekeeping of valuables;
is a kind of strongroom
is a part of bank, bank building

N  treasury, bank, exchequer, fisc, hanaper, cash register, kutcherry, bursary, strong box, strong hold, strong room, coffer, chest, safe, bank vault, depository, till, tiller, purse, money bag, money box, porte-monnaie, purse strings, pocket, breeches pocket, sinking fund, stocks, public stocks, public funds, public securities, parliamentary stocks, parliamentary funds, parliamentary securities, Consols, credit mobilier, bonds.

agent bank, bank, bank account, bank bill, bank book, bank building, bank card, bank charter, bank check, bank clerk, bank closing, bank commissioner, bank deposit, bank discount, bank draft, bank examination, bank examiner, bank failure, bank gravel, bank guard, bank holding company, bank holiday, bank identification number, bank line, bank loan, bank manager, bank martin, bank note, bank of england, bank of japan, bank on, bank rate, bank robber, bank run, bank shot, bank statement, bank swallow, bank withdrawal, barrel vault, blood bank, bottle bank, burial vault, central bank, cloud bank, coin bank, commercial bank, country bank, european central bank, eye bank, federal home loan bank system, federal reserve bank, federal savings bank, food bank, full service bank, groined vault, home loan bank, industrial bank, international bank for reconstruction and developm, lead bank, left bank, member bank, merchant bank, mutual savings bank, national bank, oyster bank, penny bank, people's bank, piggy bank, pole vault, reserve bank, ribbed vault, right bank, russian bank, savings bank, savings bank trust, sea bank, soil bank, sperm bank, state bank, vault, vault of heaven, vertical bank, west bank, world bank