2 Syllables: SU
adding, asking, aspirin, babbling, backing, banning, basking, battling, blackening, blasting, bragging, Canning, casting, catching, Catharine, Catherine, Channing, chatting, clapping, clashing, clasping, cracking, crackling, cramming, crashing, damning, dashing, dazzling, drafting, dragging, fanning, fastening, fasting, fattening, flagging, flapping, flashing, flattening, gasping, grabbing, grafting, granting, grappling, grasping, hacking, happening, hatching, having, jasmine, javelin, Katharine, Katherine, lacking, lagging, lapping, lashing, lasting, laughing, maddening, Manning, mapping, masking, massing, matching, matting, nagging, packing, padding, paddling, passing, patching, patting, planning, racking, rapine, rasping, rationing, rattling, sacking, sagging, sapling, scanning, scratching, slamming, slapping, slashing, smashing, snapping, snatching, spanning, splashing, stabbing, staffing, straggling, strapping, tacking, tackling, tanning, tapping, thrashing, tracking, trapping, traveling, travelling, wagging, wrapping
3 Syllables: SUU
annulling, battering, chattering, clamoring, clamouring, clattering, fashioning, flattering, galloping, gathering, hammering, Jacobin, labyrinth, managing, mastering, scaffolding, scattering, shattering, slackening, smattering, staggering, stammering, swaggering
3 Syllables: USU
amassing, attaching, attacking, combating, contrasting, despatching, detaching, dismantling, dispatching, enchanting, examine, harassing, surpassing, unchallenged, unflagging, unravelling
4 Syllables: USUU
4 Syllables: UUSU
Found 147 words across 5 groupings. Skipped 7 excess words of a similar stem.