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, subsidence
4 Syllables: UUSU
Found 90 words across 4 groupings. Skipped 44 excess words of a similar stem.