There are 18 words that start with 'prolog'.
| prolog | prologs | prologed |
| prologue | prologing | prologist |
| prologize | prologued | prologues |
| prologists | prologized | prologizes |
| prologuing | prologuize | prologizing |
| prologuized | prologuizes | prologuizing |
Note: These 18 words that start with 'prolog' are found from the USA & Canada version of the tournament Scrabble word list.