Hyperplasia: An increase in the number of cells in an organ or tissue. These cells appear normal under a microscope. They are not cancer, but may become cancer.
Example of difference between hyperplasia and hypertrophy in prostate.
Hyperplasia in the prostate means an increase in the size of the prostate due to an increase in the number of its cells.
Benign prostate hypertrophy means in increase in the size of the prostate due to the increase in the size of the individual cells.