The Bristol Type 156 Beaufighter, often referred to as simply the Beau, was a British long-range heavy fighter derivative of the Bristol Aeroplane Company's earlier Beaufort torpedo bomber design. The name Beaufighter is a portmanteau of "Beaufort" and "fighter".
Unlike the Beaufort, the Beaufighter had a long career and served in almost all theatres of war in the Second World War, first as a night fighter, then as a fighter bomber, eventually replacing the Beaufort as a torpedo bomber. A variant was built in Australia by the Department of Aircraft Production (DAP) and was known in Australia as the DAP Beaufighter.
Source: Wikipedia, "Bristol Beaufighter", available under the CC-BY-SA License.