There are 12 words that start with 'backd'.
| backdate | backdoor | backdrop | 
| backdated | backdates | backdraft | 
| backdrops | backdropt | backdating | 
| backdrafts | backdropped | backdropping | 
Note: These 12 words that start with 'backd' are found from the USA & Canada version of the tournament Scrabble word list.