ck

Final position(尾):jack, hack, pack, back, piggyback, drawback, rack, wrack, tack, attack, track, lack, black, slack, clack, crack, sack, smack, snack, stack, shack, quack, knack, whack, check, deck, heck, peck, speck, neck, bottleneck, turtleneck, wreck, fleck, peacock, kick, lick, click, slick, flick, pick, handpick, sick, homesick, seasick, tick, stick, chopstick, candlestick, lipstick, wick, chick, quick, thick, trick, brick, prick, gimmick, nick, bollock, lock, padlock, deadlock, gridlock, unlock, block, sunblock, roadblock, clock, o'clock, flock, frock, rock, shamrock, dock, mock, tock, sock, stock, livestock, laughingstock, shock, chock, knock, smock, cock, peacock, buttock, luck, cluck, pluck, puck, duck, buck, muck, ruck, suck, shuck, tuck, stuck, truck, struck, awestruck, dumbstruck, moonstruck, thunderstruck, chuck, yuck, ransack, hijack

Medial position(中):jacket, packet, racket, bracket, cricket, picket, pocket, rocket, bucket, tacky, tackle, cackle, crackle, shackle, ramshackle, heckle, freckle, fickle, pickle, prickle, tickle, trickle, tricky, nickel, beckon, reckon, thicken, chicken, cracker, wicker, flicker, snicker, pucker, buckle, chuckle, knuckle, honeysuckle, ruckus, package, acknowledge, cockroach, cuckoo