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

4 letters:
amok, buck, 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, starbuck, tinymuck, unstruck, witchuck, zomboruk

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

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

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

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

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

14 letters:
delivery truck, icing the puck

15 letters:
wombatdocicacuk

16 letters:
high-muck-a-muck

19 letters:
aerial ladder truck

21 letters:
annastacia palaszczuk