Or search: fagged, drained, fatigued
2 Syllables: SU
caustic, clotted, cosmic, dotted, Fawcett, frosted, Gothic, jotted, knotted, lauded, logic, nodded, Ovid, plotted, potted, prodded, profit, rotted, Slavic, spotted, squatted, trotted, wafted
3 Syllables: USU
acknowledged, agnostic, allotted, applauded, defrauded, deposit, geologic, unspotted
4 Syllables: UUSU
catastrophic, diagnostic, philosophic, physiologic, superadded, unacknowledged

Found 37 words across 3 groupings. Skipped 2 excess words of a similar stem.