Or search: oscitance, somnolence
2 Syllables: SU
devious, easiest, previous, serious, tedious, Theseus
3 Syllables: SUU
greediness, weariness
3 Syllables: USU
abstemious, Aurelius, delirious, Demetrius, Eusebius, imperious, mysterious, obsequious, Prometheus, Tiberius
4 Syllables: USUU
uneasiness
4 Syllables: UUSU
deleterious, homogeneous

Found 21 words across 5 groupings.