2 Syllables: SU
cruelties, cruelty, jewellery, jewelry
3 Syllables: SUU
beautifully, brewery, brutally, eulogy, jubilee, lunacy, mutiny, ruefully, scrutiny, stupidly, suitably, truthfully, unity, usefully, usually, usury
4 Syllables: USUU
buffoonery, community, credulity, illusory, immunity, presumably, unusually
5 Syllables: UUSUU
ambiguity, continuity, ingenuity, opportunity

Found 31 words across 4 groupings.