There are 12 12-letter words that start with 'dev'.
| devaluations | devastations | developments | 
| deverbatives | deviationism | deviationist | 
| devilishness | devitalizing | devitrifying | 
| devocalizing | devotionally | devoutnesses | 
Note: These 12 12-letter words that start with 'dev' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with devi, devo, deve, deva, devs.
4-letter words start with 'dev' (2)