There are 12 words that start with 'rereg'.
| reregister | reregulate |
| reregisters | reregulated |
| reregulates | reregistered |
| reregulating | reregulation |
| reregistering | reregulations |
| reregistration | reregistrations |
Note: These 12 words that start with 'rereg' are found from the USA & Canada version of the tournament Scrabble word list.