Or search: snide, sneering, slighting, belittling, derogatory, pejorative, derogative, deprecating, disparaging, unfavorable, deprecative, deprecatory, dyslogistic, dislogistic, supercilious
3 Syllables: SUU
centrally, centuries, century, century's, density, embassy, Emery, empathy, endlessly, energies, energy, enmity, entity, generally, memories, memory, mentally, plenary, sensibly, sensory, splendidly, tendency, tenderly
4 Syllables: SUUU
dispensary
4 Syllables: USUU
ascendancy, ascendency, contentedly, dependency, essentially, eventually, exemplary, extempore, identity, indemnity, insensibly, lamentably, nonentity, ostensibly, peremptory, potentially, relentlessly, solemnity, tremendously
4 Syllables: UUSU
elementary, incidentally
5 Syllables: UUSUU
accidentally, alimentary, complimentary, confidentially, conscientiously, documentary, fundamentally, independency, independently, indispensably, parliamentary, penitentiary, providentially, rudimentary, sedimentary, supplementary, testamentary, unintentionally
6 Syllables: UUUSUU
experimentally, plenipotentiaries

Found 65 words across 6 groupings.