3 Syllables: SUU
burglary, Burgundy, certainly, certainty, courteously, courtesy, cursory, earnestly, fervently, Germany, Mercury, nervously, nursery, perjury, purposely, surgery, tertiary, urgency, urgently
4 Syllables: SUUU
emergency
4 Syllables: USUU
absurdities, absurdity, commercially, deservedly, determinedly, eternally, eternity, externally, fraternities, fraternity, hyperbole, industrially, industriously, infirmary, internally, modernity, perversity, proverbially, subserviency, uncertainly, uncertainty
5 Syllables: UUSUU
anniversary, inadvertently, universally, universities, University, University's

Found 47 words across 4 groupings.