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, or, 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
adverse, bearer, becker, beggar, better, cellar, center, chauffeur, checkered, chequered, cheshire, chester, clever, concert, converse, convert, debtor, decker, deserts, dresser, dweller, edward, effort, emerge, enter, error, esther, ever, excerpt, fairer, feather, feller, fetter, fletcher, fresher, gesture, gether, guesswork, heather, heavier, heifer, heller, hester, insert, jester, keller, kepler, leather, leathern, ledger, leicester, leisure, leonard, leopard, leper, lesser, lester, letter, lever, measure, messrs, nestor, nether, network, never, overt, peddlers, pepper, pervert, pestered, pleasure, pressure, rarer, record, redder, research, seller, setter, settler, sever, severn, sharer, shepard, shepherd, sheppard, stellar, stretcher, sweater, teller, tenor, terror, tester, tether, transfer, transferred, transfers, traverse, treasure, tremor, trevor, vesture, wearer, weather, weber, western, westward, whether, zephyr
2 Syllables: US
absurd, adjourn, affirm, alert, amours, assert, averred, averse, avert, coerce, concern, concur, concurred, concurs, confer, conferred, confers, confirm, conserve, converge, conversed, defer, deferred, demur, demurred, deserve, dessert, deter, deterred, disbursed, discern, discoursed, disperse, disturb, diverge, diverse, divert, exert, immerse, incur, incurred, incurs, inert, infer, inferred, infers, infirm, inter, interred, inverse, invert, manoeuvres, messieurs, monsieur, observe, obverse, occur, occurred, occurs, perturbed, perverse, prefer, preferred, prefers, preserve, reaffirm, reassert, rebirth, recherche, recur, recurred, recurs, refer, referred, refers, rehearse, researched, reserve, return, reverse, revert, sojourned, submerged, subvert, superb, transverse, twothirds, unearned, unearthed, unfurled, unheard, unhurt, unnerved, usurp, vespers, wentworth
3 Syllables: SUU
3 Syllables: USU
abettors, aggressor, assessor, confessor, displeasure, dissenters, endeavor, endeavour, forever, however, investor, macgregor, midwestern, northwestern, oppressor, possessor, professor, propeller, semester, sequestered, soever, southwestern, successor, sylvester, together, transgressors, unfettered, unlettered, unmeasured, whatever, whenever, wherever, whichever, whoever
3 Syllables: UUS
4 Syllables: UUSU
4 Syllables: UUUS
5 Syllables: UUUSU
Found 420 words across 9 groupings. Skipped 183 excess words of a similar stem.