Or search: plus, asset, forte, foible, metier, vocation, mannerism, speciality, specialism, peculiarity, idiosyncrasy, individualism, individuality, individuation, specialization
2 Syllables: SU
specially
3 Syllables: SUU
daintily, faithfully, fatally, gracefully, gratefully, hastily, heavily, heraldry, painfully, penalty, playfully, racially, revelry, severally, shamefully, specialties, tastefully
3 Syllables: USU
especially
4 Syllables: USUU
disdainfully, successfully
5 Syllables: UUSUU
educationally, unsuccessfully

Found 23 words across 5 groupings.