1 Syllable: S
Ian, leant
2 Syllables: SU
beacon, beaten, ceded, cheated, chieftain, clearance, Cleveland, credence, deacon, decent, deepen, demon, deviant, Eastman, Easton, eaten, Eaton, Eden, Ephraim, Eton, ference, Freedman, freedmen, freedom, Freeman, Freeman's, frequent, Friedman, Grecian, Greenland, greeted, grievance, heated, heathen, heeded, helium, legion, Leland, lenient, lesion, median, medium, Museum, needed, Pekin, piquant, pleaded, premium, prescience, reagent, reason, recent, refund, Regent, region, seaman, seamen, season, seated, semen, sequence, serum, Stephen, Steven, Sweden, sweeten, tedium, theorem, treason, treated, treatment, weaken, Zealand
2 Syllables: US
3 Syllables: SUU
3 Syllables: USU
accretion, achievement, adherence, adherent, adhesion, agreement, allegiance, appearance, Archdeacon, Armenian, Athenian, bereavement, Bohemian, Cartesian, chameleon, coherence, coherent, cohesion, comedian, completed, completion, concealment, conceited, convenience, convenient, defeated, deleted, depletion, Ephesians, exceeded, excretion, expedient, impeachment, indecent, infrequent, ingredient, magnesium, Norwegian, obedience, obedient, Phoenician, policeman, preceded, proceeded, reappearance, receded, repeated, retreated, secreted, secretion, succeeded, uneven, unfrequent, Venetian
3 Syllables: UUS
4 Syllables: UUSU
antecedent, disagreement, disappearance, disobedience, disobedient, epithelium, incoherence, incoherent, inconvenience, inconvenient, inexpedient, interference, paroxysms, perseverance, superseded
4 Syllables: UUUS
5 Syllables: UUUSU
Found 158 words across 9 groupings. Skipped 45 excess words of a similar stem.