Or search: heracles, herakles, constellation
3 Syllables: SUU
certainties, courtesies, Germany's, nurseries
4 Syllables: SUUU
emergencies
4 Syllables: USUU
absurdities, commercially, eternally, externally, fraternities, hyperbole, internally, proverbially, uncertainties
5 Syllables: UUSUU
anniversaries, universally, universities, University's
6 Syllables: UUUSUU
involuntarily

Found 19 words across 5 groupings.