2 Syllables: SU
bidden, bidding, billing, bitten, bridging, brigands, brigham, brimming, bristling, britain, britain's, briton, cheering, chicken, chilling, chipping, christened, christening, christian, clearance, clearing, clicking, clifton, clipping, crippling, dickens, difference, different, differing, digging, dillon, dipping, distance, distant, dition, drifting, drilling, dripping, driven, earrings, fearing, ference, filling, fishing, fission, fitting, flippant, flitting, gearing, getting, gibbon, giggling, giving, glistened, glistening, griffin, grinning, gripping, hidden, higgins, hissing, hitting, ibn, islam, ism, itching, kicking, killing, kipling, kissing, kitchen, kitten, knitting, licking, lifting, linen, lisbon, listen, listening, listens, listing, lithium, living, lytton, middling, mifflin, milling, miscreant, missing, mission, nearing, nibbling, picking, pigeon, pinning, piston, pitching, pittance, pitting, pricking, printing, prism, prison, quicken, quitting, rearing, rhythm, ribbon, richmond, ridden, ridding, rigging, ripping, rippling, risen, risking, riven, schism, scribbling, scythian, serum, shearing, shifting, shilling, shipping, siblings, sicken, sifting, simmons, sinning, sipping, sitting, skimming, skipping, slipping, smiting, smitten, sneering, sniffing, spilling, spinning, spitting, splitting, steering, sticking, stiffen, stiffening, stitching, stricken, stripling, stripping, striven, swimming, switching, symonds, syringe, system, tearing, theorem, thicken, thinning, thrilling, ticking, tilings, tilling, tipping, titian, trickling, trimming, tripping, tristram, twisting, twitching, villain, vision, vivian, whipping, whistling, willing, winning, wisdom, wishing, women, women's, writhing, written
2 Syllables: US
3 Syllables: SUU
3 Syllables: USU
4 Syllables: UUSU
5 Syllables: UUUSU

Found 398 words across 6 groupings. Skipped 108 excess words of a similar stem.