Whirlybirds is a term used to refer to helicopters, also known as COPTERS (7 letters), CHOPPERS (8 letters), and eggbeaters (10 letters). Helicopters are aircrafts that use rotors to generate lift and thrust, allowing them to take off and land vertically, hover in mid-air, and fly forwards, backwards, and sideways. They are used for a variety of purposes, including search and rescue, medical transport, firefighting, and military operations.