Or search: usa, u.s., billion, jillion, zillion, cardinal, bazillion, gazillion
2 Syllables: SU
billion, brilliance, brilliant, children, children's, Dillon, Hilton, ilium, Lillian, million, Milton, pilgrim, silken, sylvan, villain, William, Wilson, Wilson's, Wilton
3 Syllables: USU
Bouillon, Brazilian, Castilian, civilian, fulfillment, fulfilment, Macmillan, pavilion, resilience, resilient, Sicilian, vermilion
4 Syllables: UUSU
Maximilian

Found 32 words across 3 groupings. Skipped 9 excess words of a similar stem.