2 Syllables: SU
asking, aspirin, baffling, basking, blasting, casting, catching, Catharine, Catherine, clashing, clasping, crashing, dashing, dazzling, fastening, fasting, flashing, gasping, grafting, grasping, hatching, having, jasmine, javelin, Katharine, Katherine, lashing, lasting, laughing, masking, massing, matching, passing, patching, rasping, rationing, scratching, slashing, smashing, snatching, splashing, staffing, thrashing, traveling, travelling
3 Syllables: USU
amassing, attaching, contrasting, despatching, detaching, dispatching, harassing, surpassing, unravelling
4 Syllables: UUSU
Found 55 words across 3 groupings. Skipped 2 excess words of a similar stem.