2 Syllables: SU
beckon, Bedlam, Breton, deaden, Edmond, Edmund, Edwin, Epsom, extant, leaden, Leben, pregnant, reckon, rectum, reddened, requiem, second, section, segment, septum, sexton, spectrum, threaten, veteran, weapon
3 Syllables: SUU
3 Syllables: USU
acceptance, affection, collection, complexion, conception, connection, connexion, convection, correction, deception, defection, deflection, dejection, detection, direction, ejection, election, erection, exception, expectant, inception, infection, inflection, injection, inspection, investment, objection, perception, perfection, projection, protection, reception, reflection, reflexion, rejection, selection, subjection
4 Syllables: UUSU
circumspection, disaffection, imperfection, insurrection, interregnum, intersection, introspection, Mahometan, misconception, preconceptions, predilection, recollection, reelection
Found 76 words across 4 groupings. Skipped 41 excess words of a similar stem.