Prostrate is an adjective. Meanings: flat; face down; horizontal.
Prostate is that which is relating to the prostate gland
Examples of Prostrate:
1. The yoga teacher told the group to first lie down prostrate.
2. The disciple became prostrate at his Guruji's feet.
Examples of Prostate:
1. The doctor told the patient to get an X-ray done of the region near the prostate gland.
2. Manjunath was happy to know that a new drug had been discovered to help in curing prostate cancer.