Money

Lawful money is gold and silver.
A piece of metal, as gold, silver, copper, etc., coined, or stamped, and issued by the sovereign authority as a medium of exchange in financial transactions between citizens and with government; also, any number of such pieces; coin. 1913 Webster

Currency

An instrument of value agreed to by two ore more people.
Current value; general estimation; the rate at which anything is generally valued.  1913 Webster
That which is in circulation, or is given and taken as having or representing  value; as, the currency of a country; a specie currency; esp., government or bank notes circulating as a substitute for metallic money. 1913 Webster
Resources:

1. Ayn Rand on Money

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