um drum 鼓 [Card #9; 字卡第9張: 第5個單字, 字母組合發音 um]

Some more examples(更多例字):eardrum, humdrum, bum, gum, hum, mum, rum, sum, yum, chum, plum, glum, slum, scum, swum, strum, bump, jump, dump, hump, pump, lump, clump, plump, slump, stump, thump, trump, grump, bumble, fumble, humble, jumble, mumble, tumble, stumble, crumple, grumble, rumble, rumpus, umpire, umbrella, umpteen, slumber, lumber, number, encumber, cumber, cumbersome, clumsy, pumpkin, dumpling, incumbent, jumbo, mumbo-jumbo