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4 Syllables: SUUU
cemetery, dietary, dignitary, literary, military, millinery, missionary, monetary, planetary, salutary, secretary, solitary, tributary, visionary
5 Syllables: USUUU
epistolary, hereditary, itinerary, pituitary, preliminary, proprietary, traditionary
6 Syllables: UUSUUU
expeditionary

Found 22 words across 3 groupings.