There are 16 7-letter words that start with 'dou'.
| doubled | doubler | doubles | doublet | 
| doubted | doubter | doucely | douceur | 
| douched | douches | doughty | dourahs | 
| dourest | dourine | dousers | dousing | 
Note: These 16 7-letter words that start with 'dou' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with doub, doug, dour, douc, dous, doum, doup, doul, douz, doux.
4-letter words start with 'dou' (3)