Or search: zip, vigor, vigour, strenuosity
3 Syllables: SUU
beverages, blemishes, cherishes, cherishing, editing, heritage, marriages, menaces, Meredith, messages, parishes, penitent, perishes, perishing, registering, vestiges
4 Syllables: USUU
competitive, disparaging, percentages, repetitive, replenishing

Found 21 words across 2 groupings.