3 Syllables: SUU
clarified, edified, emphasise, emphasize, mechanized, memorized, paralyzed, petrified, rarefied, specialised, specialized, specified, sterilized, terrified, verified
4 Syllables: USUU
exemplified, exemplifies, exemplify, identified, identifies, identify, indemnify, unspecified
5 Syllables: UUSUU
unidentified

Found 24 words across 3 groupings. Skipped 2 excess words of a similar stem.