There are 12 words that start with 'regim'.
| regime | regimen |
| regimes | regimens |
| regiment | regiments |
| regimental | regimented |
| regimentals | regimenting |
| regimentation | regimentations |
Note: These 12 words that start with 'regim' are found from the USA & Canada version of the tournament Scrabble word list.