There are 19 words that start with 'devel'.
| devel | devels | 
| develed | develop | 
| develing | develope | 
| develops | developed | 
| developer | developes | 
| developpe | developers | 
| developing | developpes | 
| developable | development | 
| developments | developmental | 
| developmentally | |
Note: These 19 words that start with 'devel' are found from the USA & Canada version of the tournament Scrabble word list.