2 Syllables: SU
families, family, family's
3 Syllables: SUU
amnesty, aniline, Antony, anxiously, bankruptcy, Chancery, fantasy, frantically, handsomely, manfully, mantelpiece, randomly, scantily, thankfully
4 Syllables: USUU
financially, philanthropy, substantially
5 Syllables: UUSUU
instantaneously, understandably

Found 22 words across 4 groupings.