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
anchoring, annulling, answering, battering, chattering, clambering, clamouring, clattering, fashioning, flattering, galloping, gathering, hammering, hampering, hankering, Jacobin, labyrinth, managing, mastering, scattering, shattering, slackening, smattering, staggering, stammering, swaggering, tampering
3 Syllables: USU
4 Syllables: USUU
Found 50 words across 4 groupings. Skipped 4 excess words of a similar stem.