Or search: demonstrably, incontrovertibly
2 Syllables: SU
jewelry
3 Syllables: SUU
beautifully, brewery, brutally, eulogy, gloomily, jubilee, lunacy, mutiny, ruefully, scrutiny, stupidly, suitably, unity, usually, usury
4 Syllables: USUU
buffoonery, communities, community, credulity, illusory, immunity, presumably
5 Syllables: UUSUU
ambiguities, ambiguity, continuity, importunities, ingenuity, opportunities, opportunity

Found 30 words across 4 groupings.