The term 'Cannon Nickname' refers to three nicknames given to a cannon, which are EER (3 letters), DYAN (4 letters), and ADE (3 letters). The first nickname, EER, is derived from the Dutch word for iron, which was used to make cannons. The second nickname, DYAN, is derived from the French word for thunder, which was used to describe the sound of a cannon firing. The third nickname, ADE, is derived from the Latin word for fire, which was used to describe the power of a cannon.