3 Syllables: SUU
ambulance, Andersen, Anderson, Anderson's, Anglican, banishment, blandishments, grandchildren, management, mandarin, Sanderson
4 Syllables: USUU
abandonment, aggrandisement, enfranchisement, entanglement, mismanagement

Found 16 words across 2 groupings. Skipped 1 excess word of a similar stem.