Or search: stormy, furious, tearing, vehement, ferocious, merciless, boisterous, unmerciful
2 Syllables: SU
clearness, dearest, eras, fearless, nearest, nearness, peerage, serious, vitreous
3 Syllables: USU
delirious, Demetrius, imperious, mysterious, severest, Severus, sincerest, Tiberius
4 Syllables: UUSU
deleterious

Found 18 words across 3 groupings.