2 Syllables: SU
acid, acrid, added, adding, asking, aspirin, averaged, avid, babbling, backing, baffling, banning, basking, battling, blasted, blasting, bragging, Canning, casting, catching, Catharine, Catherine, Channing, chatted, chatting, clapping, clashing, clasping, cracking, crackling, cramming, crashing, damaged, damning, dashing, dazzling, drafting, dragging, fanning, fasted, fastening, fasting, flaccid, flagging, flapping, flashing, gasping, grabbing, grafting, granted, granting, grappling, grasping, hacking, hatching, having, jasmine, javelin, Katharine, Katherine, lacking, lagging, lapping, lashing, lasted, lasting, laughing, managed, Manning, mapping, masking, massing, matching, matted, matting, nagging, packaged, packing, padded, padding, paddling, passing, patching, patted, patting, placid, planning, planted, rabid, racking, rapid, rapine, rasping, rationing, rattling, ravaged, sacking, sagging, sapling, scanning, scratching, slamming, slanted, slapping, slashing, smashing, snapping, snatching, spanning, splashing, stabbing, staffing, straggling, strapping, tacking, tackling, tanning, tapping, thrashing, tracking, trapping, traveling, travelling, valid, vapid, wagging, wrapping
3 Syllables: USU
amassing, attaching, attacking, combated, combating, contrasting, despatching, detaching, dispatching, enchanted, enchanting, examine, harassing, Mohammed, surpassing, unchallenged, unflagging, unravelling
4 Syllables: UUSU
Found 147 words across 3 groupings. Skipped 5 excess words of a similar stem.