1 Syllable: S
Ian, leant
2 Syllables: SU
beacon, beaming, beaten, beating, being, bleaching, bleating, bleeding, breathing, breeding, ceasing, ceding, ceiling, cheating, cheering, chieftain, cleaning, clearance, clearing, cleaving, Cleveland, creaking, credence, creeping, deacon, dealing, decent, deeming, deepen, demon, deviant, dreaming, earrings, easing, Eastman, Easton, eaten, eating, Eaton, Eden, Ephraim, Eton, even, evening, fearing, feasting, feeding, feeling, ference, Fielding, fleeing, fleeting, Freedman, freedmen, freedom, freeing, Freeman, Freeman's, freezing, frequent, Friedman, gearing, gleaming, gleanings, Grecian, Greenland, greeting, grievance, grieving, healing, heaping, hearing, heathen, heating, heaving, heeding, helium, jeering, keeping, kneeling, leading, leaking, leaning, leaping, leasing, leaving, legion, Leland, lenient, lesion, meaning, median, medium, meeting, Museum, nearing, needing, peeling, peeping, peering, Pekin, piquant, pleading, pleasing, preaching, precinct, premium, prescience, reaching, reading, reagent, realism, reaping, rearing, reason, recent, reeking, reeling, refund, Regent, region, scheming, screaming, screeching, screening, sealing, seaman, seamen, season, seating, seeding, seedlings, seeing, seeking, seeming, seething, seizing, semen, sequence, serum, shearing, sheepskin, shielding, shrieking, sleeping, sneaking, sneering, sneezing, speaking, speeding, squeaking, squeezing, stealing, steaming, steering, Stephen, Steven, streaming, Sweden, sweeping, sweeten, syringe, teaching, tearing, teasing, tedium, teeming, theorem, thieving, treason, treating, treatment, weaken, weaning, weaving, weeding, weekend, weeping, wheeling, wielding, yielding, Zealand
2 Syllables: US
3 Syllables: SUU
3 Syllables: USU
accretion, achievement, achieving, adherence, adherent, adhering, adhesion, agreeing, agreement, allegiance, appealing, appearance, appearing, appeasing, Archdeacon, Armenian, Athenian, believing, bereavement, beseeching, besieging, Bohemian, Cartesian, chameleon, coherence, coherent, cohesion, comedian, competing, completing, completion, concealing, concealment, conceding, conceiving, convenience, convenient, convening, deceiving, defeating, depletion, displeasing, endearing, entreating, Ephesians, exceeding, excretion, expedient, farreaching, fatiguing, foreseeing, impeachment, impeding, increasing, indecent, infrequent, ingredient, intriguing, magnesium, misleading, Norwegian, obedience, obedient, perceiving, Phoenician, policeman, policemen, policing, preceding, proceeding, reappearance, reappearing, receding, receiving, redeeming, releasing, relieving, repealing, repeating, retreating, retrieving, revealing, secretion, succeeding, unceasing, uneven, unfeeling, unfrequent, unpleasing, unreasoning, unyielding, Venetian, wellbeing
3 Syllables: UUS
4 Syllables: UUSU
antecedent, disagreeing, disagreement, disappearance, disappearing, disobedience, disobedient, domineering, engineering, epithelium, guaranteeing, incoherence, incoherent, inconvenience, inconvenient, inexpedient, interference, interfering, intervening, overweening, paroxysms, perseverance, persevering, pioneering, superseding, unbelieving, volunteering
4 Syllables: UUUS
5 Syllables: UUUSU
Found 320 words across 9 groupings. Skipped 64 excess words of a similar stem.