Or search: gall, hate, animus, hatred, rancor, tension, rancour, animosity, hostility, aggression, antagonism, resentment, belligerence, belligerency
3 Syllables: SUU
centuries, century's, chemically, densities, density, embassies, emphases, enmity, entities, entity, Kennedy, lenity, remedied, remedies, remedy, sensibly, splendidly, tendencies
4 Syllables: USUU
amenities, Appendices, contentedly, dependencies, extremities, extremity, identities, identity, immensity, indemnity, insensibly, intensities, intensity, lamentably, nonentity, obscenity, ostensibly, parentheses, propensities, propensity, serenity, solemnities, solemnity
5 Syllables: UUSUU
indispensably
6 Syllables: UUUSUU
plenipotentiaries

Found 43 words across 4 groupings.