bung-hole

n hole for filling or emptying a barrel 桶孔.

bumble, bumble-bee, bumbling, bumf (also bumph), bump, bumper, bumper-to-bumper, bumph, bumpily, bumpiness, bumpkin, bumptious, bumptiously, bumptiousness, bumpy, bun, bun-fight, bunch, bundle, bung, bungalow, bungle, bungler, bungling, bunion, bunk, bunker, bunkum, bunny, Bunsen burner, bunting, buoy, buoyancy, buoyant, buoyantly, bur (also burr), burble, burden, burdensome, bureau,