2 Syllables: SU
Abbot, Abbott, actress, adage, agate, Alex, aptness, arras, Assoc, Atlas, axis, badness, ballast, ballot, baptised, Baptist, barrack, basket, blackest, blackness, brackets, cabbage, Cabot, cactus, Caliph, callous, captious, carrot, casket, Cassius, Dallas, damask, facet, factious, faggots, fastest, flatness, gallop, gamut, gladness, gratis, gravest, habeas, habit, hammock, hapless, happiest, hatchet, havoc, jacket, Janet, lapis, lattice, madness, Madras, Magnus, malice, mattress, package, packet, paddock, Paget, palace, palate, palette, Pallas, pallet, planet, rabbit, Sabbath, sadness, slackness, status, tablet, taxes
3 Syllables: SUU
3 Syllables: USU
analysed, compactness, Damascus, disastrous, elaborate, exactness, inhabit, Johannes, paralysed, Parnassus
4 Syllables: UUSU
Found 89 words across 4 groupings. Skipped 15 excess words of a similar stem.