Or search: tenacity, persistence, perseverance, tenaciousness
3 Syllables: SUU
Byzantine, differently, distantly
4 Syllables: USUU
consistency, consistently, deficiencies, deficiency, efficiencies, efficiency, efficiently, Epiphany, exigencies, exigency, indifferently, insistently, persistently, proficiency, sufficiency, sufficiently
5 Syllables: UUSUU
aborigines, inconsistency, inefficiency, insufficiency, insufficiently, intermittently

Found 25 words across 3 groupings.