There are 17 words that start with 'pror'.
| prorate | prorated | prorates |
| prorogue | prorating | proration |
| proreform | prorogate | prorogued |
| prorogues | prorations | prorogated |
| prorogates | proroguing | prorogating |
| prorogation | prorogations | |
Note: These 17 words that start with 'pror' are found from the USA & Canada version of the tournament Scrabble word list.