Or search: bench, brass, curia, issuer, regime, winery, ecesis, academy, ecology, executive, judiciary, bionomics, perfumery, vicariate, federation
3 Syllables: SUU
Addison, Addison's, banishment, baptism, Madison
4 Syllables: USUU
establishments
5 Syllables: UUSUU
reestablishment

Found 7 words across 3 groupings. Skipped 1 excess word of a similar stem.