Or search: crack, audience, possibleness
3 Syllables: SUU
eulogies, stupidly, suitably, Tuileries, unity
4 Syllables: USUU
communities, community, credulity, immunity, presumably
5 Syllables: UUSUU
ambiguities, ambiguity, continuity, importunities, ingenuity, opportunity

Found 16 words across 3 groupings.