There are 15 words that start with 'roi'.
| roil | roils | roily |
| roiled | roilier | roiling |
| roister | roiliest | roisters |
| roistered | roisterer | roisterers |
| roistering | roisterous | roisterously |
Note: These 15 words that start with 'roi' are found from the USA & Canada version of the tournament Scrabble word list.