2 Syllables: SU
bidden, bidding, billing, blurring, bridging, brimming, bristling, building, burning, bursting, cheering, chilling, chipping, chirping, christening, churning, circling, clearing, clicking, clipping, crippling, curbing, curling, cursing, curving, differing, digging, dipping, drilling, dripping, during, earning, earrings, Erwin, fearing, filling, fishing, fitting, flirting, flitting, gearing, getting, Gibbons, giggling, gilding, given, giving, glistening, Griffin, grinning, gripping, gurgling, herding, herdsmen, Higgins, hissing, hitting, hurling, hurting, Irving, Irwin, itching, jerking, kicking, killing, Kipling, kissing, knitting, learning, licking, listening, listing, living, lurking, merging, Merlin, middling, Mifflin, milking, milling, missing, nearing, nibbling, nursing, Perkins, picking, pigeon, pilgrim, pinning, pitching, pitting, pricking, printing, purging, quitting, rearing, ridding, rigging, ripping, rippling, risking, scribbling, searching, serving, shearing, shilling, shipping, siblings, sinning, sipping, sitting, skimming, skipping, skirting, slipping, smiting, sneering, sniffing, spilling, spinning, spitting, splitting, spurring, steering, sterling, sticking, Stirling, stirring, stitching, stripling, stripping, sturgeon, surgeon, surging, swimming, swirling, switching, syringe, tearing, thinning, thirsting, thrilling, ticking, tilings, tilling, tilting, tipping, trickling, trimming, tripping, turning, twirling, twisting, twitching, urging, verging, vermin, virgin, whipping, whirling, whirlwind, whistling, Wilkins, willing, winning, wishing, wording, working, workmen, worsening, writhing, yearning
3 Syllables: SUU
3 Syllables: USU
4 Syllables: UUSU
5 Syllables: UUUSU

Found 265 words across 5 groupings. Skipped 17 excess words of a similar stem.