2 Syllables: SU
bitten, brigands, Brigham, Britain, Britain's, Briton, chicken, Cyprian, Dickens, Dickson, diction, dictum, Dixon, fiction, flippant, friction, Gibbon, Gibson, Gideon, gypsum, hidden, Ibn, idiom, kitten, Lytton, Nixon, Pitman, pittance, quicken, ribbon, ridden, shipment, sicken, Sigmund, sixpence, smitten, stricken, thicken, Whitman, written
3 Syllables: SUU
3 Syllables: USU
addiction, admittance, afflictions, ascription, benignant, commitment, conscription, constriction, conviction, depiction, description, Egyptian, enlistment, equipment, incipient, indignant, infliction, inscription, malignant, meridian, midshipman, prediction, prescription, proscription, recipient, remittance, restriction, rewritten, subscription, transcription, unbidden, unwritten
3 Syllables: UUS
4 Syllables: UUSU
benediction, concomitant, contradiction, crucifixion, dereliction, equilibrium, intermittent, jurisdiction, superscription
Found 83 words across 5 groupings. Skipped 26 excess words of a similar stem.