There are 12 words that start with 'diese'.
| diesel | dieses | 
| diesels | dieseled | 
| dieseling | dieselize | 
| dieselings | dieselized | 
| dieselizes | dieselizing | 
| dieselization | dieselizations | 
Note: These 12 words that start with 'diese' are found from the USA & Canada version of the tournament Scrabble word list.