2 Syllables: SU
actress, adage, aptness, Atlas, axis, badness, baptised, Baptist, blackest, blackness, cabbage, cactus, captious, factious, flatness, gladness, gratis, habeas, hapless, happiest, lapis, lattice, madness, Madras, Magnus, mattress, package, Sabbath, saddest, sadness, slackness, status, taxes, vastness
3 Syllables: USU
4 Syllables: UUSU
Found 36 words across 3 groupings. Skipped 2 excess words of a similar stem.