2 Syllables: SU
clotted, dotted, frosted, jotted, knotted, lauded, nodded, Ovid, plotted, potted, prodded, rotted, spotted, squatted, trotted
3 Syllables: USU
acknowledged, allotted, applauded, defrauded, exhausted, unspotted
4 Syllables: UUSU
superadded, unacknowledged

Found 23 words across 3 groupings.