There are 13 words that start with 'prosta'.
| prostate | prostates |
| prostatic | prostatism |
| prostatisms | prostatitis |
| prostacyclin | prostacyclins |
| prostaglandin | prostatectomy |
| prostatitises | prostaglandins |
| prostatectomies | |
Note: These 13 words that start with 'prosta' are found from the USA & Canada version of the tournament Scrabble word list.