There are 11 14-letter words that start with 'def'.
| defeminization | defenestrating |
| defenestration | defervescences |
| defibrillating | defibrillation |
| defibrillators | defibrinations |
| definitenesses | definitiveness |
| deforestations | |
Note: These 11 14-letter words that start with 'def' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with defe, defi, defo, defl, defa, defr, defu, deft, deff, defy.
4-letter words start with 'def' (3)