3 letters:
cel, kol, rol, sal, sil, sol, sul

4 letters:
boal, bohl, bole, boll, bowl, buol, cele, cell, ciel, coal, cole, dole, foal, fohl, goal, gohl, hoel, hohl, hole, kohl, kole, mohl, mole, nohl, nole, noll, pohl, pole, poll, rohl, role, roll, saal, sahl, sail, sale, sall, saul, seal, seel, seil, sell, sewn, sill, so's, soak, soap, sohm, soil, sola, sold, soli, soll, solo, solt, sope, sowa, sown, sows, stol, toal, tole, toll, wohl, sole, soul

5 letters:
boehl, coale, colle, dhole, doell, foale, hoell, knoll, koehl, noell, pfohl, poehl, roehl, roell, rolle, salle, sayle, seale, searl, selle, sewed, skoal, soave, solar, soler, soles, soley, solie, soule, souls, sower, stohl, stole, stoll, thole, voell, whole, woehl, seoul, sowle

6 letters:
hoelle, knoell, koelle, roelle, schaul, searle, sowles, thoele, toelle

7 letters:
scholle, seoul's