2 Syllables: SU
anno, ano, arrow, backbone, Barrow, Blackstone, Castro, facto, fallow, Gladstone, Glasgow, hallow, Harrow, macro, narrow, Palo, Paso, sallow, shadow, shallow, tallow, Tasso
3 Syllables: USU
4 Syllables: UUSU
Found 28 words across 3 groupings. Skipped 3 excess words of a similar stem.