There are numerous synonyms for the word "dollar bill." Some of the most common ones include greenback, banknote, legal tender, cash, currency note, and federal reserve note. Other lesser-known synonyms for a dollar bill may include buck, one-dollar piece, dollar paper, and single. The term "dollar bill" is predominantly used in the United States, but the currency itself is recognized worldwide. While the appearance of the dollar bill may have changed over the years, its value remains constant and vital in daily financial transactions. No matter what synonym is used, a dollar bill holds the same significance as an integral component of the global economy.