2 Syllables: SU
abbess, active, Agnes, ashes, average, axes, Bacchus, badges, baggage, Baptist, batches, blackish, blacksmith, brackish, cabbage, captive, carriage, castings, catches, clashes, classes, crashes, damage, dashes, fastenings, flashes, gases, glasses, grasses, hatches, lapses, lashes, manage, masses, massive, matches, package, Papists, passage, passes, passeth, passive, patches, practice, practise, Radcliffe, rapids, ravage, saplings, sashes, satis, savage, scratches, snatches, splashes, taxes, trackless, trappings, waxes
3 Syllables: USU
adaptive, Agassiz, attaches, attractive, collapses, combative, despatches, dispatches, establish, impassive, inactive, reactive, refractive, relapses, relaxes, surpasses, unchallenged
4 Syllables: UUSU
5 Syllables: UUUSU
Found 81 words across 4 groupings. Skipped 13 excess words of a similar stem.