3 letters:
buc, duc, duk, kuc, kuk, luk, suc, suk, yuk, zuk

4 letters:
amok, buck, duck, guck, huck, kruk, kuck, luck, mruk, muck, puck, ruck, suck, tuck, wnuk, yuck, zuck

5 letters:
amuck, bruck, canuk, chaac, chuck, clich, cluck, cruck, cv ic, d-a-c, druck, dvach, fb mc, fluck, fp mc, fslic, gluck, grick, hmfic, hucke, iacuc, induc, jcmec, jpnic, jsdoc, kluck, knuck, kruck, lucke, mcc-h, mp mc, naruc, ncmec, pluck, queck, rhtic, sc mc, sc uk, shuck, skrik, sllic, slock, smuck, snick, snuck, stacc, stuck, trikk, truck, wrock, wruck, xpeke

6 letters:
bd ecc, brucke, canuck, cdm mc, choque, cmt uk, dcr mc, jsfuck, jtf ak, mps mc, mp pic, nb pic, nsc uk, phoque, phpdoc, pte uc, pwm ic, rh tic, rs ecc, scf uk, schuch, schuck, shmuck, shpock, skrukk, spucke, struck, stucke, the cw, untuck, wb pic, wfq ic, wtfock, yttric

7 letters:
aqueduc, by luck, calmuck, cmtc ic, crc cic, ddn nic, ed buck, gccs mc, gcss mc, geoduck, gmf sic, hplc ic, hsa uwc, hv slic, kachuck, kentuck, lv slic, misluck, montcuq, potluck, ppdm mc, raybuck, roebuck, schlich, schluck, schmuck, ssc pic, teetuck, tnds eq, tst ceq, tuk-tuk, unstuck, upchuck, wtc nyc

8 letters:
bad luck, bluebuck, bushbuck, cmtc tic, dbpc req, fishbach, headfuck, ill luck, megabuck, mmse seq, nip/tuck, numchuck, nunchuck, pot-luck, putchuck, reedbuck, sea duck, starbuck, tinymuck, unstruck, witchuck, zomboruk

9 letters:
alan ruck, awestruck, blackbuck, bme click, cold duck, cornshuck, dumptruck, firetruck, fish duck, fist-fuck, get stuck, give suck, gmmse sic, good luck, hard-luck, homestuck, huckabuck, lake duck, lame duck, lsdxs sic, mallemuck, marshbuck, muckamuck, musk duck, naugatuck, prongbuck, rockchuck, semitruck, stonebuck, sunstruck, waterbuck, wild duck, woodchuck, wood duck

10 letters:
awe-struck, black buck, black duck, bruce buck, cash truck, dumbstruck, dump truck, filmstruck, fire truck, hand truck, lovestruck, moonstruck, motortruck, mucky-muck, queer duck, ruddy duck, semi-truck, seo in-guk, springbuck, starstruck, sun-struck, toonstruck, windstruck, young buck

11 letters:
battletruck, clutterbuck, diving duck, donald duck, heartstruck, hockey puck, love-struck, muck-a-muck, panel truck, sonderdruck, sound truck, stagestruck, star-struck, summer duck, taylor ruck, tuktoyaktuk

12 letters:
chuck-a-luck, clustertruck, collet chuck, garden truck, ladder truck, muckety-muck, panic-struck, pickup truck, sitting duck, trolleytruck, wonderstruck

13 letters:
dabbling duck, garbage truck, horror-struck, laundry truck, mandarin duck, planet-struck, terror-struck, thunderstruck, trailer truck, wonder-struck

14 letters:
delivery truck, icing the puck

15 letters:
howard the duck, wombatdocicacuk

16 letters:
high-muck-a-muck

19 letters:
aerial ladder truck

21 letters:
annastacia palaszczuk