2 Syllables: SU
asking, aspirin, babbling, baffling, basking, battling, blackening, blasting, casting, catching, Catharine, clashing, clasping, crashing, dashing, dazzling, drafting, fastening, fasting, fattening, flashing, flattening, gasping, grafting, grappling, grasping, happening, hatching, having, jasmine, javelin, Katharine, Katherine, lashing, lasting, laughing, maddening, masking, massing, matching, paddling, passing, patching, platinum, rasping, rationing, rattling, scratching, slashing, smashing, snatching, splashing, staffing, tackling, thrashing, traveling, travelling
3 Syllables: SUU
adamant, adjutant, annulling, aspirant, battering, Cameron, chattering, clamoring, clamouring, clattering, fashioning, flattering, galloping, garrisoned, garrisons, gathering, hammering, Jacobin, labyrinth, Madison, managing, masculine, mastering, sacrament, Saracen, scattering, shattering, slackening, smattering, staggering, stammering, stratagem, swaggering
3 Syllables: USU
amassing, attaching, contrasting, despatching, detaching, dismantling, dispatching, harassing, surpassing, unravelling
4 Syllables: USUU
4 Syllables: UUSU
Found 104 words across 5 groupings. Skipped 8 excess words of a similar stem.