There are 12 words that start with 'monst'.
| monster | monstera |
| monsters | monsteras |
| monstrous | monstrance |
| monstrances | monstrosity |
| monstrously | monstrosities |
| monstrousness | monstrousnesses |
Note: These 12 words that start with 'monst' are found from the USA & Canada version of the tournament Scrabble word list.