2 Syllables: SU
bison, Brian, brighten, Brighton, Bryan, Bryant, Byron, Byron's, client, diamond, Dryden, frighten, giant, guidance, heighten, Heinemann, Highland, Hiram, Iceland, ion, island, item, Ivan, Leiden, Leyden, licence, license, lichen, lighten, liken, lion, Lyman, Lyon, migrant, pliant, ripen, Ryan, science, scion, Sidon, silence, silent, Simon, Simon's, sion, siren, stipend, strident, tighten, Titan, trident, triumph, tyrant, viands, vibrant, violence, violent, widen, Zion
3 Syllables: SUU
3 Syllables: USU
alignment, alliance, appliance, assignment, asylum, atheism, compliance, compliant, confinement, connivance, consignment, contrivance, defiance, defiant, defilement, enlighten, enliven, environ, excitement, Hawaiian, horizon, incitement, indictment, Orion, refinement, reliance, reliant, unlicensed
4 Syllables: UUSU
Found 90 words across 4 groupings. Skipped 44 excess words of a similar stem.