A chief gunner or the most skilled gunner in a military unit, especially on a ship.
From arch- (chief, principal) + gunner (a soldier who operates guns). Gunner comes from gun, which entered English in the 14th century from Old Norse gunnr (war), combined with the agent suffix -er.
On medieval and early modern warships, the archgunner was often the most valued crew member—commanding the cannons required mathematical skill, chemical knowledge, and split-second timing, making them early specialists in what we'd now call engineering.
Complete word intelligence in one call. Free tier — 50 lookups/day.