Or search: bush, shrub, cistus, helianthemum
2 Syllables: SU
abo, auto, borrows, crossroads, follows, grotto, hollows, lago, motto, mottoes, Otto, sorrows, Stockholm, Strabo, swallows, topmost
3 Syllables: USU
bravado, Chicago, Dorado, Morocco, mulatto, staccato, tomato, tomatoes, tomorrow's
4 Syllables: UUSU
Colorado, Santiago

Found 27 words across 3 groupings.