Or search: cactus, saguaro
2 Syllables: SU
abo, Arno, aro, Austro, auto, Barlow, borrow, Bravo, cargo, cargoes, Carlo, Caro, charcoal, follow, grotto, hollow, lago, largo, Malo, Marco, morrow, Moscow, motto, Otto, Paulo, Roscoe, sorrow, Strabo, swallow, wallow
3 Syllables: USU
4 Syllables: UUSU

Found 48 words across 3 groupings. Skipped 4 excess words of a similar stem.