There are 18 words that start with 'redef'.
| redefy | redefeat |
| redefect | redefied |
| redefies | redefine |
| redefeats | redefects |
| redefined | redefines |
| redefying | redefeated |
| redefected | redefining |
| redefeating | redefecting |
| redefinition | redefinitions |
Note: These 18 words that start with 'redef' are found from the USA & Canada version of the tournament Scrabble word list.