Or search: roach, blattaria
2 Syllables: SU
abo, auto, grotto, lago, motto, mottoes, Otto, Stockholm, Strabo, topmost
3 Syllables: USU
bravado, Chicago, Dorado, Morocco, mulatto, staccato, tomato, tomatoes
4 Syllables: UUSU
Colorado, Santiago

Found 20 words across 3 groupings.