2 Syllables: SU
acid, acrid, added, ashes, average, avid, badges, baggage, batches, blasted, cabbage, carriage, castings, catches, chatted, clashes, classes, crashes, damage, dashes, Fascist, fasted, fastenings, flaccid, flashes, gases, glasses, granted, grasses, hatches, lashes, lasted, lavish, manage, masses, massive, matches, matchless, matted, package, padded, passage, passes, passeth, passive, patches, pathless, patted, placid, planted, rabid, rapid, ravage, ravished, saplings, sashes, savage, scratches, slanted, snatches, splashes, trappings, valid, vapid
3 Syllables: USU
Agassiz, attaches, combated, combative, despatches, dispatches, enchanted, impassive, Mohammed, pugnacious, rapacious, surpasses, unchallenged
4 Syllables: UUSU
Found 78 words across 3 groupings. Skipped 8 excess words of a similar stem.