There are 13 words that start with 'regres'.
| regress | regressed |
| regresses | regressor |
| regressing | regression |
| regressive | regressors |
| regressions | regressively |
| regressivity | regressiveness |
| regressivities | |
Note: These 13 words that start with 'regres' are found from the USA & Canada version of the tournament Scrabble word list.