Or search: gob, yap, trap
2 Syllables: SU
3 Syllables: USU
Barbadoes, Diego, Horatio, octavo, potato, potatoes, tomato, tomatoes, tornado, volcano, volcanoes
4 Syllables: UUSU
5 Syllables: UUSUU

Found 24 words across 4 groupings. Skipped 1 excess word of a similar stem.