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

Found 19 words across 3 groupings. Skipped 10 excess words of a similar stem.