2 Syllables: SU
bias, blindness, brightest, brightness, childless, China's, crisis, driest, dryness, finest, guileless, guises, highest, Highness, ibis, ices, Isis, kindest, kindness, lias, lifeless, lightest, lightness, likeness, liveliest, mightiest, mildest, mildness, mileage, minus, pious, Pius, priceless, prices, primus, prius, prizes, righteous, ripeness, rises, shyness, Silas, sinus, sizes, slices, slightest, spices, tightness, timeless, tiniest, Titus, typhus, vices, whiteness, widest, wildness, wisest
2 Syllables: US
3 Syllables: USU
advices, Aquinas, arthritis, bronchitis, comprises, Darius, devices, Elias, Goliath, impious, Matthias, politeness, Tobias, unbiased, unbiassed, unkindness, unrighteous, uprightness
4 Syllables: UUSU
Found 80 words across 4 groupings. Skipped 1 excess word of a similar stem.