Or search: nominal
2 Syllables: SU
fiddler, listener, prisoner
3 Syllables: SUU
Christopher, minister, similar, vinegar, Whitaker
4 Syllables: USUU
Commissioner, conspirator, deliverer, dissimilar, inquisitor, parishioners, perimeter, petitioner, practitioner, solicitor

Found 18 words across 3 groupings. Skipped 11 excess words of a similar stem.