Or search: dubiety, distrust, mistrust, suspense, disbelief, misgiving, indecision, skepticism, indefinity, incredulity, reservation, dubiousness, irresolution, peradventure, improbability
3 Syllables: SUU
Burgundy, certainly, certainties, certainty, courtesies, currencies, currency, currently, fervently, Germany, Germany's, Hercules, nurseries, urgency, urgently
4 Syllables: SUUU
emergencies, emergency
4 Syllables: USUU
absurdities, concurrently, determinedly, fraternities, subserviency, uncertainly, uncertainty
5 Syllables: UUSUU
anniversaries, inadvertently, universities, University's

Found 28 words across 4 groupings.