A unified study of inversions on ℘ words resulted from the importance of words and inversions in molecular biology. In this study, we generalize the idea of inversion by using a technique called block inversion on finite rich ℘ words. A comparison of block inversion on finite total words and on finite ℘ words is made. We conclude that the total number of ℘ words in the block inversion set of a finite rich ℘ word of length n is strictly less than 2n–1.