Some basic important vocabulary related to money:

A.T.M. : abbr. Automated Teller Machine; cash dispenserUK.
(bank)note : a piece of paper money; billUS.
billUS : a banknote; a piece of paper money.
black market : illegal traffic in officially controlled commodities such as foreign currency.
bureau de change : establishment where currencies of different countries may be exchanged.
cash : 1 coins or bank notes (not cheques); 2 actual money paid as opposed to credit.
cash dispenserUK : automatic machine from which clients of a bank may withdraw money; ATM.
cashier : person dealing with cash transactions in a bank, store etc.
coin : a piece of metal money.
currency : the money in general use or circulation in any country.
debt : money etc owed by one person to another.
exchange rate : the rate at which one currency can be exchanged for another.
foreign exchange : the currency of other countries.
hard currency : currency that will probably not fall in value and is readily accepted.
invest : to put money for profit into business, land etc - investment n.
legal tender : currency that cannot legally be refused in payment of a debt.
petty cashUK : a cash fund for small, everyday expenses.
soft currency : currency that will probably fall in value and is not readily accepted.
speculate : (risky) buying of foreign currency, land etc for rapid gain - speculation n.
transaction : an (usually commercial) exchange; a deal - to transact v.