Or search: uncertainty, uncertainness, precariousness, indetermination
3 Syllables: SUU
desperately, generally, preferably, separately
4 Syllables: SUUU
celibacy, creditably, definitely, delicacy, delicately, generously, perilously, sedulously, treacherously
4 Syllables: USUU
confederacy
5 Syllables: USUUU
degeneracy, effeminacy, incredulously, indefinitely, inevitably, inseparably, intelligibly, professionally, unquestionably
5 Syllables: UUSUU
irrevocably

Found 24 words across 5 groupings.