Or search: bag, grip, solon, statesman, portmanteau
2 Syllables: SU
backbone, Blackstone, facto, macro, sandstone, shadow
3 Syllables: USU
foreshadowed, tobacco
4 Syllables: UUSU
Colorado, overshadow

Found 10 words across 3 groupings. Skipped 3 excess words of a similar stem.