Or search: falseness, changeability, changeableness, unpredictability
2 Syllables: SU
quandary
3 Syllables: SUU
commonly, consciously, constancy, Constantine, constantly, Conversely, Lombardy, quantity, wantonly, wrongfully
4 Syllables: USUU
astronomy, autonomy, demonstrably, despondency, economies, economy, subconsciously, taxonomy, uncommonly, unconsciously
5 Syllables: UUSUU
Deuteronomy, horizontally

Found 23 words across 4 groupings.