Or search: doriden, sedative, depressant, medication, medicament, glutethimide
1 Syllable: S
dour, flour, hour, our, scour, sour
2 Syllables: SU
Bauer, bower, counter, coward, Cowper, downward, flounder, flower, founder, Fowler, Gower, groundwork, hour's, housework, Howard, Howard's, louder, outer, outward, pounder, powder, power, prouder, scoured, shower, sounder, soured, stouter, tower, trousers, voucher
3 Syllables: USU
devour, empower, encounter, profounder
4 Syllables: UUSU
overpower

Found 42 words across 4 groupings. Skipped 28 excess words of a similar stem.