3 letters:
wik, wix, wyk

4 letters:
wick

5 letters:
vicar, wicca, wicke, wicks, wiker

6 letters:
bicker, dicker, ficker, kicker, licker, liquor, picker, ricker, sicker, ticker, vicker, wacker, walker, weaker, wecker, weiker, wickes, wickey, widder, widger, wilker, willer, wimmer, winger, winker, winner, wisher, wisser, wither, witter, worker, zycher, wicker

7 letters:
knicker, quicker, thicker, weicker, whisker, whither, wichern, wickard, wickert, witcher, zwicker

8 letters:
schicker, which're, whitcher