1 Syllable: S
2 Syllables: SU
bidden, bidding, billing, binding, biting, blighting, blinding, bribing, bridging, Brien, brightening, brimming, bristling, buying, cheering, chilling, chipping, christening, Christian, citing, clearing, clicking, climbing, clipping, crippling, crying, cycling, differing, digging, dining, dipping, diving, drifting, drilling, dripping, driving, drying, dyeing, dying, earrings, eyeing, fearing, fighting, filing, filling, finding, firing, fishing, fitting, flitting, flying, frightening, frying, gearing, getting, Gibbons, giggling, given, giving, gliding, glistening, Griffin, grinding, grinning, gripping, guiding, heightening, hiding, Higgins, hiring, hissing, hitting, idling, itching, kicking, killing, Kipling, kissing, knitting, licking, lifting, lighting, lightning, liking, lining, listening, listing, living, lying, middling, Mifflin, milling, minding, mining, missing, nearing, nibbling, picking, pigeon, piling, pining, pinning, piping, pitching, pitting, plying, pricing, pricking, priming, printing, prying, quitting, rearing, rhyming, ridding, riding, rigging, righting, rinding, ripening, ripping, rippling, rising, risking, scribbling, shearing, shifting, shilling, shining, shipping, siblings, siding, sifting, sighing, sighting, signing, sinning, sipping, sitting, sizing, skimming, skipping, sliding, slipping, smiling, smiting, sneering, sniffing, spilling, spinning, spitting, splitting, spying, steering, sticking, stiffening, stifling, stitching, striding, striking, stripling, stripping, striving, styling, swimming, switching, syringe, tearing, thinning, thrilling, thriving, ticking, tidings, tightening, tiling, tilling, timing, tipping, tiring, tribesmen, trickling, trifling, trimming, tripping, twining, twisting, twitching, tying, typing, Viking, vying, whining, whipping, whistling, whitening, Whiting, willing, winding, winning, wiping, wiring, wishing, writing
3 Syllables: SUU
3 Syllables: USU
abiding, acquiring, adhering, admiring, admitting, advising, alighting, appearing, applying, arising, arriving, ascribing, aspiring, assigning, assisting, befitting, beginning, beguiling, bewitching, combining, committing, compiling, complying, comprising, confiding, confining, consisting, conspiring, contriving, deciding, declining, defining, defying, delighting, denying, depriving, deriving, describing, designing, desiring, despising, devising, disguising, disliking, dismissing, distilling, dividing, divining, emitting, enlisting, enquiring, enriching, enticing, entitling, equipping, exciting, existing, expiring, forbidding, forgiving, fulfilling, imbibing, implying, inciting, inclining, inquiring, insisting, inspiring, instilling, inviting, misgiving, obliging, omitting, permitting, persisting, perspiring, prescribing, presiding, providing, reappearing, reciting, reclining, refining, relying, reminding, remitting, repining, replying, requiring, residing, resigning, resisting, retiring, revising, reviving, rewriting, submitting, subscribing, subsiding, subsisting, sufficing, supplying, surprising, surviving, thanksgiving, transcribing, transmitting, undying, uniting, unwilling, unwitting
4 Syllables: UUSU
coinciding, disappearing, domineering, engineering, interfering, overlying, persevering, pioneering, preexisting, underlying, uninviting, unremitting, volunteering
5 Syllables: UUUSU
Found 330 words across 6 groupings. Skipped 20 excess words of a similar stem.