2 Syllables: SU
acting, adding, asking, aspirin, Atkins, babbling, backing, baffling, banning, basking, battling, blackening, blasting, bragging, Canning, casting, catching, Channing, chatting, clapping, clashing, clasping, cracking, crackling, cramming, crashing, damning, dashing, dragging, fanning, fastening, fasting, fattening, flagging, flapping, flashing, flattening, gasping, grabbing, granting, grappling, grasping, hacking, happening, hatching, having, javelin, lacking, lagging, lapping, lashing, lasting, laughing, maddening, Manning, mapping, masking, massing, matching, matting, nagging, napkin, packing, padding, paddling, passing, patching, patting, planning, racking, rapine, rasping, rattling, sacking, sagging, sapling, scanning, scratching, slamming, slapping, slashing, smashing, snapping, snatching, spanning, splashing, stabbing, staffing, straggling, strapping, tacking, tackling, tanning, tapping, taxing, thrashing, tracking, trapping, traveling, travelling, wagging, waxing, wrapping
3 Syllables: USU
abstracting, adapting, amassing, attaching, attracting, collapsing, combating, contrasting, despatching, detaching, dispatching, distracting, enacting, enchanting, exacting, examine, extracting, harassing, reacting, relapsing, relaxing, subtracting, surpassing, transacting, unchallenged, unflagging, unravelling
4 Syllables: UUSU
Found 133 words across 3 groupings. Skipped 6 excess words of a similar stem.