There are 12 words that start with 'rigi'.
| rigid | rigidly |
| rigidify | rigidity |
| rigidness | rigidified |
| rigidifies | rigidities |
| rigidifying | rigidnesses |
| rigidification | rigidifications |
Note: These 12 words that start with 'rigi' are found from the USA & Canada version of the tournament Scrabble word list.