2 Syllables: SU
blooded, blunted, Brunswick, buttoned, Drummond, dusted, flooded, fronted, functioned, funded, glutted, grunted, hubbub, humbug, hundred, Ludwig, roughened, rugged, rusted, Rutland, stomach, studded, stunted, summit, summoned, sunlit, trumpet, trusted, upland
2 Syllables: US
3 Syllables: USU
100, accustomed, adjusted, affronted, confronted, discouraged, disgusted, distrusted, encouraged, encrusted, entrusted, intrusted, mistrusted, refunded
4 Syllables: UUSU
Found 45 words across 4 groupings. Skipped 6 excess words of a similar stem.