2 Syllables: SU
abbess, actions, active, actress, adage, Agnes, aptness, Atkins, Atlas, axes, axioms, axis, Bacchus, badness, baggage, baptised, Baptist, blackest, blackish, blackness, blacksmith, brackish, cabbage, cactus, captains, captious, captive, factions, factious, flatness, fractions, gladness, gratis, habeas, hapless, happenings, happiest, Jackson's, lapis, lapses, lattice, madness, Madras, Magnus, mattress, maxims, napkins, package, Papists, practice, practise, Radcliffe, Sabbath, saddest, sadness, satis, Saxons, slackness, status, trackless, waxes
3 Syllables: USU
abstractions, adaptive, attractions, attractive, collapses, combative, compactness, contractions, distractions, establish, exactions, exactness, inactive, infractions, reactions, reactive, refractive, relapses, relaxes, transactions
4 Syllables: UUSU
5 Syllables: UUUSU
Found 89 words across 4 groupings. Skipped 10 excess words of a similar stem.