Or search: desk, helper, supporter, repository, amanuensis, escritoire, secretaire, receptionist, stenographer
4 Syllables: SUUU
cemetery, dietary, dignitary, emissary, medullary, military, monetary, necessary, planetary, salutary, secretaries, Secretary's, seminary, solitary, tributary, veterinary
5 Syllables: USUUU
discretionary, hereditary, pituitary, proprietary, unnecessary

Found 21 words across 2 groupings.