Or search: lance, shaft, spear
2 Syllables: SU
Adam, adding, adjunct, Alan, Allan, Allen, Allen's, alum, Ammon, annum, arrant, ashen, Ashton, asking, aspen, aspirin, Aston, Athens, atom, babbling, backing, baffling, balance, banning, Baron, barren, basking, bastion, baton, battling, blacken, blackening, blasting, bracken, bragging, cabin, Canning, cannon, canon, Caspian, casting, catching, Catharine, Catherine, challenge, Channing, chaplain, chasm, Chatham, chatting, clapping, clashing, clasping, cracking, crackling, craftsman, cramming, crashing, damning, dashing, datum, dazzling, drafting, dragging, dragon, draughtsman, famine, fanning, fashion, fasten, fastening, fastens, fasting, fathom, fatten, fattening, flagging, flapping, flashing, flatten, flattening, gallant, gallon, gasping, Gaston, gladden, grabbing, grafting, Grafton, granting, grappling, grasping, hacking, Hallam, Hammond, happen, happening, happens, hatching, Hatton, having, jasmine, Kaplan, Katharine, Katherine, lacking, lagging, lapping, lashing, lasting, Latham, Latin, laughing, Madam, Madame, Madden, maddening, Mammon, Manning, mapping, masking, massing, Masson, matching, matin, matting, nagging, packing, padding, paddling, pageant, passing, passion, patching, patent, patting, Patton, phantom, planning, platinum, racking, rapine, rasping, ration, rationing, rations, rattling, sacking, saddened, saffron, sagging, salmon, sapling, satin, savants, scanning, scratching, Shannon, Sharon, slacken, slamming, slapping, slashing, smashing, snapping, snatching, spanning, spasm, splashing, stabbing, staffing, Staten, straggling, strapping, Stratton, stratum, tacking, tackling, talent, talons, tanning, tapping, thrashing, tracking, trapping, traveling, travelling, wagging, waggon, wagon, wrapping
3 Syllables: SUU
3 Syllables: USU
4 Syllables: USUU
4 Syllables: UUSU

Found 262 words across 5 groupings. Skipped 56 excess words of a similar stem.