1 Syllable: S
2 Syllables: SU
beacon, beaten, chieftain, clearance, cleveland, credence, deacon, decent, deepen, demon, deviant, eastman, easton, eaten, eden, ephraim, eton, ference, freedman, freedmen, freedom, freeman, freeman's, frequent, friedman, grecian, greenland, grievance, heathen, helium, legion, leland, lenient, lesion, median, medium, museum, pekin, piquant, premium, prescience, reagent, reason, recent, refund, regent, region, seaman, seamen, season, semen, sequence, serum, stephen, steven, sweden, sweeten, tedium, theorem, treason, 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, completion, concealment, convenience, convenient, depletion, ephesians, excretion, expedient, impeachment, indecent, infrequent, ingredient, magnesium, norwegian, obedience, obedient, phoenician, policeman, secretion, uneven, unfrequent, venetian
4 Syllables: UUSU
antecedent, athenaeum, caribbean, disagreement, disappearance, disobedience, disobedient, epicurean, epithelium, european, incoherence, incoherent, inconvenience, inconvenient, inexpedient, interference, mausoleum, paroxysms, perseverance, reappearance
5 Syllables: UUUSU
Found 135 words across 7 groupings. Skipped 46 excess words of a similar stem.