Lancasters are a type of aircraft that were used by the Royal Air Force during World War II. Synonyms for the term "Lancasters" include bomber planes, heavy bombers, warplanes, and military aircraft. These planes were specifically designed to drop bombs on enemy targets and were a crucial component in the Allied effort during the war. Other synonyms for Lancasters may include various models such as the Avro Lancaster, the Lancaster B.III, or the Lancaster Mk.VIII. These aircraft were well-known for their durability, speed, and ability to carry a heavy bomb load, which made them essential for bombing missions over Europe.