Or search: sack, garner, realise, realize
1 Syllable: S
Berg, Bern, Berne, Bert, berth, birch, bird, birth, blur, blurred, bur, burg, Burke, Burke's, burn, burnt, Burr, burst, Burt, church, churn, clerk, cur, curb, curl, current, curs, curse, curt, curve, dearth, der, dirge, dirt, durch, durst, Earl, Earle, Earls, earn, earth, er, Ernst, ers, fer, fern, fir, firm, firs, first, Firth, fleur, flirt, for, freer, fur, germ, gird, girl, girt, girth, heard, hearse, her, herb, herd, hers, Hirsch, hurl, Hurst, hurt, jerk, jours, Ker, Kern, Kerr, Kirk, Kurt, learn, learnt, lurch, lurk, mer, merge, mirth, myrrh, nerve, nurse, oeuvre, pearl, per, perch, Pere, pers, pert, Perth, pur, purge, purse, scourge, search, serf, serge, serv, serve, shirk, shirt, Sir, skirt, slur, sperm, spur, spurn, spurred, spurs, spurt, stern, Sterne, stir, stirred, stirs, sur, sure, surf, surge, swerve, swirl, ter, term, tern, terse, third, thirst, tors, turf, Turk, turn, urge, urn, ver, verb, verge, vers, verse, vert, were, wert, whirl, word, work, world, worm, worse, worst, worth, yearn, yer, yours
2 Syllables: SU
2 Syllables: US
3 Syllables: SUU
3 Syllables: UUS
4 Syllables: UUUS

Found 285 words across 6 groupings. Skipped 125 excess words of a similar stem.