There are 14 words that start with 'regist'.
| register | registry | 
| registers | registrar | 
| registered | registrant | 
| registrars | registries | 
| registering | registrable | 
| registrants | registerable | 
| registration | registrations | 
Note: These 14 words that start with 'regist' are found from the USA & Canada version of the tournament Scrabble word list.