a request for payment of money owed, or the piece of paper on which it is written:
bill
(an amount of) money paid to the government that is based on your income or the cost of goods or services you have bought:
tax
the money that is used in a particular country at a particular time:
currency
the money you keep, esp. in a bank or other financial organization:
savings
an amount of money paid:
payment
to exchange goods for other things rather than for money:
barter
the amount of money that can be received for something:
value
the act of giving something to someone and them giving you something else:
exchange