2 Syllables: SU
babbling, baffling, battling, blackening, Catherine, dazzling, fastening, fattening, flattening, grappling, happening, javelin, Katherine, maddening, paddling, platinum, rationing, rattling, tackling, traveling, travelling
3 Syllables: SUU
accident, adamant, adjutant, annulling, aspirant, battering, Cameron, chattering, clamoring, clamouring, clattering, fashioning, flattering, galloping, garrisoned, garrisons, gathering, hammering, labyrinth, Madison, managing, masculine, mastering, sacrament, Saracen, scattering, shattering, slackening, smattering, staggering, stammering, stratagem, swaggering
3 Syllables: USU
4 Syllables: USUU
Found 58 words across 4 groupings. Skipped 8 excess words of a similar stem.