3 Syllables: SUU
foolishly, musically, nudity, unities, unity, uselessly
4 Syllables: USUU
annuities, annuity, communities, community, community's, conclusively, confusedly, exclusively, gratuity, immunities, immunity, impunity
5 Syllables: UUSUU
assiduity, contiguity, importunity, incongruities, incongruity, incredulity, perpetuity, perspicuity, superfluity, unobtrusively

Found 28 words across 3 groupings.