2 Syllables: SU
blushes, bulbous, buttons, clutches, cousins, customs, dozens, dullest, dullness, dulness, luggage, ovens, Prussians, rushes, Russians, Russia's, summons, tonnage, touches, uplands
3 Syllables: USU
4 Syllables: UUSU
Found 24 words across 3 groupings. Skipped 2 excess words of a similar stem.