Or search: irony, incompatibility
3 Syllables: SUU
musically, nudity, unities, unity
4 Syllables: USUU
annuities, annuity, communities, community, community's, confusedly, gratuity, immunities, immunity, impunity
5 Syllables: UUSUU
assiduity, contiguity, importunity, incongruity, incredulity, perpetuity, perspicuity, superfluity
6 Syllables: UUUSUU
discontinuity

Found 23 words across 4 groupings.