Or search: pleb, denizen, dweller, plebeian, habitant, indweller, inhabitant, nonintellectual
2 Syllables: SU
histories
3 Syllables: SUU
fisheries, guillotine, liveries, miseries, mysteries, Philippine, Philistine, Pyrenees, similes, trilogy, tyrannies, vicarage
3 Syllables: USU
deliveries
4 Syllables: USUU
abilities, affinities, antipathies, antipodes, antiquities, civilities, conspiracies, divinities, facilities, festivities, hostilities, proclivities, utilities
5 Syllables: UUSUU
aborigines, capabilities, disabilities, liabilities, possibilities, probabilities
6 Syllables: UUUSUU
impossibilities, responsibilities, susceptibilities

Found 36 words across 6 groupings. Skipped 1 excess word of a similar stem.