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, written
3 Syllables: SUU
3 Syllables: USU
addiction, admittance, affliction, 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 82 words across 5 groupings. Skipped 27 excess words of a similar stem.