1 Syllable: S
Ian, leant
2 Syllables: SU
beacon, beaten, bitten, brigands, Brigham, Britain, Britain's, Briton, chicken, christened, clearance, Cleveland, credence, deacon, decent, deepen, demon, Dickens, difference, different, Dillon, distance, distant, dition, driven, Easton, eaten, Eaton, Eden, Ephraim, Eton, fearsome, ference, fission, flippant, freedom, Freeman, Freeman's, frequent, Gibbon, given, glistened, Grecian, grievance, heathen, hidden, Ibn, ism, kitchen, kitten, legion, Leland, lesion, linen, listen, Lytton, Miriam, mission, Museum, Pearson, Pekin, pigeon, piquant, piston, pittance, prism, prison, quicken, reagent, reason, recent, refund, Regent, region, rhythm, ribbon, ridden, risen, riven, schism, seaman, seamen, season, semen, sequence, serum, sicken, Simmons, smitten, Stephen, Steven, stiffen, stricken, striven, Sweden, sweeten, Symonds, Syrian, system, theorem, thicken, Titian, treason, Tristram, villain, vision, weaken, women, women's, written, Zealand
2 Syllables: US
3 Syllables: SUU
3 Syllables: USU
accretion, addition, adherence, adherent, adhesion, admission, admittance, agreement, allegiance, ambition, appearance, Archdeacon, arisen, assistance, assistant, Assyrian, attrition, Bouillon, Cartesian, cognition, coherence, coherent, cohesion, collision, commission, completion, condition, consistence, consistent, contrition, criterion, decision, deficient, delirium, deliverance, depletion, derision, division, edition, efficient, Elysian, emission, envision, Ephesians, excision, excretion, existence, existent, experience, forgiven, Franciscan, fruition, ignition, imperium, imprison, incision, indecent, indifference, indifferent, infrequent, insistence, insistent, logician, Macmillan, Macpherson, magician, munitions, musician, Norwegian, nutrition, omission, omniscience, omniscient, Parisian, partition, patrician, perdition, permission, persistence, persistent, petition, Phoenician, physician, policeman, position, precision, proficient, provision, reappearance, religion, remission, remittance, rendition, resistance, resistant, revision, rewritten, secretion, sedition, Shakespearean, Siberian, submission, subsistence, sufficient, suspicion, technician, tradition, transition, transmission, tuition, unbidden, uneven, unfrequent, unwritten, Venetian, volition
3 Syllables: UUS
4 Syllables: UUSU
abolition, acquisition, admonition, ammunition, antecedent, apparition, beneficent, circumcision, coalition, coefficient, coexistence, competition, composition, concomitant, definition, demolition, deposition, disagreement, disappearance, disposition, disquisition, ebullition, electrician, equidistant, erudition, exhibition, expedition, exposition, Hanoverian, imposition, incoherence, incoherent, inconsistent, indecision, inefficient, inexperience, inhibition, Inquisition, insufficient, interference, intermission, intermittent, intuition, irreligion, malnutrition, nonexistent, opposition, paroxysms, perseverance, politician, precondition, premonition, preposition, Presbyterian, prohibition, proposition, recognition, reminiscence, reminiscent, repetition, requisition, rhetorician, statistician, superstition, supervision, supposition, transposition
4 Syllables: UUUS
5 Syllables: UUUSU
academicians, decomposition, Elizabethan, indisposition, interposition, juxtaposition, mathematician, metaphysician, predisposition, presuppositions, superposition
Found 320 words across 9 groupings. Skipped 133 excess words of a similar stem.