Or search: timber, timbre, ringing, sonority, resonance, reverberance
3 Syllables: SUU
agencies, agency, aimlessly, amiably, anciently, daintily, halfpenny, masonry, painfully, patiently, shamefully, shamelessly, vacancies, vacancy
4 Syllables: USUU
complacency, complacently, disdainfully, impatiently, mistakenly, spontaneously
5 Syllables: UUSUU
interchangeably, simultaneously
6 Syllables: UUUSUU
contemporaneously

Found 23 words across 4 groupings.