Or search: capstone, stretcher
2 Syllables: SU
bono, cocoa, Colo, Como, homo, loco, Logos, mono, novo, ono, Otho, ozone, photo, Polo, Provost, solo, toto
4 Syllables: UUSU
virtuoso

Found 18 words across 2 groupings. Skipped 1 excess word of a similar stem.