2 Syllables: SU
babbling, baffling, battling, blackening, cancelling, Catherine, dangling, dazzling, fastening, fattening, flattening, gambling, grappling, handling, happening, javelin, Katherine, maddening, paddling, rambling, rationing, rattling, scrambling, strangling, tackling, traveling, travelling, wrangling
3 Syllables: SUU
annulling, battering, chattering, clamoring, clamouring, clattering, fashioning, flattering, galloping, gathering, hammering, Jacobin, labyrinth, managing, mastering, scattering, shattering, slackening, smattering, staggering, stammering, swaggering
3 Syllables: USU
4 Syllables: USUU
Found 52 words across 4 groupings. Skipped 4 excess words of a similar stem.