2 Syllables: SU
biggest, bigness, British, citrus, fictions, fitness, fittest, fixes, hideous, igneous, Ipswich, Nicholas, nitrous, piteous, prettiest, quibus, quickest, quickness, sickness, strictest, strictness, thickest, thickness, victims, vitreous, witness
3 Syllables: USU
afflictions, amphibious, assiduous, convictions, descriptions, descriptive, eclipses, Egyptians, enigmas, eyewitness, fastidious, inscriptions, insidious, invidious, Mauritius, perfidious, predictions, predictive, prescriptions, prescriptive, restrictions, restrictive, subscriptions, unfitness, vindictive
4 Syllables: UUSU
Found 54 words across 3 groupings. Skipped 2 excess words of a similar stem.