Or search: debacle, collapse
2 Syllables: SU
anno, ano, arrow, Barrow, Castro, cathode, fallow, Glasgow, hallow, Harrow, macro, narrow, Palo, Paso, sallow, shadow, shallow, tallow, Tasso
3 Syllables: USU
piano, soprano, tobacco
4 Syllables: UUSU
Colorado, overshadow

Found 24 words across 3 groupings.