3 Syllables: SUU
Deism, Denison, Edison, evidenced, Harrison, Harrison's, hesitant, merriment, negligence, negligent, penitence, precedent, President, President's, residence, resident, reticence, reticent, Sheridan, Tennyson, theism
4 Syllables: USUU
5 Syllables: UUSUU
Found 26 words across 3 groupings. Skipped 2 excess words of a similar stem.