Dollars, the monetary unit used in many countries around the world, has several synonyms that are commonly used. The most popular synonyms for the word "dollars" include bucks, greenbacks, cash, dough, loot, moolah, scratch, and bread. Buck is a term commonly used in the United States, and it derives from the use of buckskins, which were once used as currency. Greenbacks, on the other hand, was used during the American Civil War to refer to the paper currency that was printed in green ink. Cash, dough, and loot are generic slang terms used to describe money, while moolah and scratch are more recent slang words. Bread, another slang term, is believed to have originated from the phrase "earn your daily bread".