2 Syllables: SU
babbling, baffling, battling, blackening, Catherine, dazzling, fastening, fattening, flattening, grappling, happening, javelin, Katherine, maddening, paddling, rationing, rattling, tackling, traveling, travelling
3 Syllables: SUU
annulling, battering, chattering, clamoring, clamouring, clattering, fashioning, flattering, gathering, hammering, Jacobin, labyrinth, managing, mastering, scattering, shattering, slackening, smattering, staggering, stammering, swaggering
3 Syllables: USU
4 Syllables: USUU
Found 43 words across 4 groupings. Skipped 4 excess words of a similar stem.