THESAURUS
aperture, automatic, blowgun, blowpipe, broaching, cavity, chasm, check, clearing, cleft, crack, disclosure, fenestra, firearm, fistula, flamethrower, fontanel, foramen, gap, gape, gulf, gun, handgun, heater, hiatus, hole, hollow, inlet, interval, lacuna, laying open, leak, musket, opening, opening up, orifice, outlet, passageway, peashooter, piece, pistol, pore, repeater, revolver, rifle, rod, sawed-off shotgun, shooting iron, shotgun, six-gun, six-shooter, slot, space, split, stoma, throwing open, uncorking, unstopping, yawn
