Or search: saddle, stapes, tympanum
2 Syllables: SU
buckets, buffet, buttocks, buttressed, circuit, couplets, covet, dullest, fervid, girded, hermit, musket, puppet, roughest, stirrups, stomach, Suffolk, summit, surfeit, syrup, target, toughest, turnip, turret, worship, worshipped, worships
3 Syllables: USU
asserted, averted, concerted, inserted, interpret, reasserted, Republic, rivulets

Found 35 words across 2 groupings. Skipped 8 excess words of a similar stem.