1 Syllable: S
4, berg, bern, berne, bert, berth, birch, bird, birth, blur, blurred, boar, boards, boars, boer, bore, born, borne, bourne, bur, burg, burke, burke's, burn, burnt, burr, burst, burt, chord, chore, church, churn, clerk, coarse, cor, cords, core, cork, corn, corp, corpse, cours, course, court, cur, curb, curl, current, curs, curse, curt, curve, dearth, der, dirge, dirt, door, dor, dore, drawer, durch, durst, dwarf, earl, earle, earls, earn, earth, er, ernst, ers, fer, fern, fir, firm, firs, first, firth, fleur, flirt, floor, for, forbes, force, ford, fore, forge, fork, form, forme, forms, fort, forte, forth, forts, four, fourths, freer, fur, george, germ, gird, girl, girt, girth, gore, gorge, gourd, heard, hearse, her, herb, herd, hers, hirsch, hoar, hoards, hoarse, horde, horn, hors, horse, hurl, hurst, hurt, jerk, jours, ker, kern, kerr, kirk, kurt, learn, learnt, lor, lords, lore, lorn, lurch, lurk, mer, merge, mirth, moore, moore's, mor, more, morn, morse, mort, mourn, myrrh, nerve, nor, norm, norse, north, nurse, oar, oeuvre, orb, ord, ore, org, orr, ort, pearl, per, perch, pere, pers, pert, perth, por, porch, pore, pork, port, porte, ports, pour, pur, purge, purse, quart, quartz, roar, schwartz, scorched, score, scorn, scourge, search, serf, serge, serv, serve, shirk, shirt, shore, shorn, short, sir, skirt, slur, snort, soar, sor, sore, sort, source, sperm, spores, sport, spur, spurn, spurred, spurs, spurt, stern, sterne, stir, stirred, stirs, store, stork, storm, stuart, sur, sure, surf, surge, sward, swarm, swerve, swirl, sword, swore, sworn, ter, term, tern, terse, third, thirst, thor, thorn, thorpe, thwart, tor, torch, tore, torn, torre, tors, tort, tours, toward, turf, turk, turn, urge, urn, ver, verb, verge, vers, verse, vert, war, wards, warm, warn, warp, wars, wart, were, wert, wharf, whirl, whore, wor, words, wore, work, world, worm, worn, worse, worst, worth, yearn, yer, yore, york, york's, your
2 Syllables: SU
2 Syllables: US
3 Syllables: SUU
3 Syllables: UUS
4 Syllables: UUSU
4 Syllables: UUUS

Found 506 words across 7 groupings. Skipped 245 excess words of a similar stem.