2 Syllables: SU
abo, aro, Austro, auto, borrow, Bravo, Caro, Congo, console, follow, grotto, hollow, Johnstone, lago, Malo, Montrose, morrow, Moscow, motto, Otto, Paulo, Roscoe, Sancho, sorrow, Strabo, stronghold, swallow, tanto, wallow
3 Syllables: USU
Alfonso, Alonzo, Apollo, bravado, Chicago, Dorado, Fernando, Morocco, mulatto, Palazzo, Romano, soprano, staccato, tomato, tomorrow, Toronto
4 Syllables: UUSU

Found 47 words across 3 groupings. Skipped 1 excess word of a similar stem.