Gun-howitzer

Sometimes the distinction between an artillery gun and a howitzer becomes blurred due to the development of gun-howitzers that can perform both roles. The best-known Allied gun-howitzer used during World War II was the British 25-Pounder Gun, which had a caliber of 87 mm.

The Pattern of 1857 12-pounder Napoleon gun-howitzer was one of the most versatile and popular field pieces used during the Civil War. […] Although technically a gun, the Napoleon was often referred to as a gun-howitzer for its ability to also fire explosive shell.