3 letters:
mis

4 letters:
bice, dice, dise, dyce, feis, hice, kies, lice, mace, maia, mass, maya, mess, mier, mies, mike, mile, mime, mine, mire, miss, mite, mize, mohs, moss, muhs, myer, myre, nice, nyce, rice, tice, tyce, vice, vise, weis, wice, mice

5 letters:
deiss, geise, geiss, guice, heise, heiss, leiss, maass, maese, mass., masse, mauss, meece, meese, meier, meise, merce, meyer, might, mikes, mites, moose, mouse, moyse, reiss, weiss, wrice, zeiss

6 letters:
buysse, gneiss, maisch, meisch, meiser, miesse, mike's, mousse, theiss, weisse