A field gun is a type of artillery weapon that is designed to be mobile and used in the field during battles. There are several synonyms for the term field gun, including artillery, cannon, howitzer, and mortar. These weapons are typically used to deliver indirect fire to enemy positions and can be used to support ground troops during battles. The term artillery refers to large guns or cannons that are capable of firing heavy shells over long distances. A howitzer is a type of short-barrelled gun that is used to fire high trajectory shells, while a mortar is a type of artillery weapon that is used to fire explosive shells at short ranges.