There are 18 words that start with 'retre'.
| retread | retreat |
| retreads | retreats |
| retrench | retreaded |
| retreated | retreater |
| retreading | retreatant |
| retreaters | retreating |
| retrenched | retrenches |
| retreatants | retrenching |
| retrenchment | retrenchments |
Note: These 18 words that start with 'retre' are found from the USA & Canada version of the tournament Scrabble word list.