Or search: arianism, docetism, tritheism, zurvanism, gnosticism, marcionism, orientation, pelagianism, nestorianism, nonconformity, monophysitism, nonconformism, nonconformance, albigensianism
3 Syllables: SUU
charities, destinies, elegies, enemies, enemy's, Genevieve, heresy, jealousies, kerosene, legacies, melodies, memories, parodies, pedigrees, Pericles, recipes, remedies, reveries, treasuries, variously, verities
4 Syllables: USUU
accessories, amenities, barbarities, disparities, extremities, precariously
5 Syllables: UUSUU
similarities
6 Syllables: UUUSUU
irregularities, peculiarities

Found 30 words across 4 groupings.