Nicknames: greenback, buck, green, dough, smacker, bones, dead presidents, scrillas, paper

Coins:
Freq Used: 1¢, 5¢, 10¢, 25¢
Rarely Used: $1, 50¢

Banknotes:
Freq Used: $1, $5, $10, $20, $50, $100
Rarely Used: $2

Central Bank:
Federal Reserve Bank
Website: http://www.federalreserve.gov