Or search: caryophyllaceae
2 Syllables: SU
chieftain, clearance, Eastman, Ephraim, fearsome, ference, Pearson, prescience, serum, theorem
3 Syllables: USU
adherence, adherent, appearance, coherence, coherent, impeachment, imperium, Macpherson, reappearance
4 Syllables: UUSU
disappearance, incoherence, incoherent, interference, perseverance

Found 24 words across 3 groupings. Skipped 3 excess words of a similar stem.