Or search: actinomycetal
2 Syllables: SU
Cyrus, direst, iris, pirates, violets, virus
3 Syllables: SUU
diocese, quietness, righteousness, riotous
3 Syllables: USU
desirous, papyrus
4 Syllables: USUU
psychiatrist, unrighteousness

Found 14 words across 4 groupings. Skipped 1 excess word of a similar stem.