2 Syllables: SU
biggest, bigness, bridges, brigands, Britain's, Britons, chickens, citrus, Dickens, dishes, eras, fishes, fitness, fittest, Griffith, hideous, igneous, image, kisses, kitchens, kittens, linens, liquids, listens, missions, mixes, Nicholas, nitrous, peerage, pigeons, piteous, Plymouth, prettiest, prisms, prisons, quibus, quickens, quickness, rhythms, ribbons, riches, ridges, schisms, sickness, Simmons, strictest, strictness, switches, Symonds, synods, systems, theorems, thickens, thickness, village, villains, villas, visage, visions, vistas, vitreous, witches, witness, women's
3 Syllables: USU
additions, admissions, ambitions, amphibious, assiduous, collisions, commissions, conditions, decisions, divisions, editions, emissions, enigmas, eyewitness, fastidious, Franciscans, incisions, insidious, invidious, logicians, magicians, Mauritius, munitions, musicians, omissions, partitions, patricians, perfidious, petitions, physicians, positions, provisions, religions, revisions, suspicions, technicians, traditions, transitions, unfitness
4 Syllables: UUSU
acquisitions, admonitions, apparitions, coalitions, competitions, compositions, definitions, depositions, dispositions, disquisitions, exhibitions, expeditions, expositions, impositions, inhibitions, intuitions, oppositions, politicians, prepositions, prohibitions, propositions, repetitions, requisitions, statisticians, superstitions, suppositions
5 Syllables: UUUSU
Found 133 words across 4 groupings. Skipped 4 excess words of a similar stem.