The US dollar is both money and currency, depending on the context in which the term is used.
As currency, the dollar refers to the physical bills and coins that are used as a medium of exchange in the United States. The US dollar is issued and regulated by the Federal Reserve, which is the central bank of the United States. The physical currency is backed by the full faith and credit of the US government and is widely recognized as a legitimate medium of exchange both domestically and internationally.
As money, the dollar is a broader concept that encompasses all assets that are used as a medium of exchange, a unit of account, and a store of value. This includes not only physical currency but also bank deposits, stocks, bonds, and other financial instruments denominated in dollars. The dollar is a widely accepted currency in global trade and finance and is currently used as a reserve currency by many central banks around the world. The dollar is also the world standard currency for oil, hence the term Petro dollar.
In summary, the dollar is both money and currency, depending on the context in which the term is used. As currency, the dollar refers to physical bills and coins that are used as a medium of exchange, while as money, it encompasses a broader range of assets used as a medium of exchange, a unit of account, and a store of value.