3 Syllables: SUU
burgesses, earnestness, furnaces, hermitage, nervousness, purchases, purposeless, purposes, services, surpluses, worthlessness
4 Syllables: USUU
affirmative, alternative, conservative, disturbances, divergences, encourages, interpretive, observances, preservative, superlative
Found 21 words across 2 groupings. Skipped 2 excess words of a similar stem.