There are 7 12-letter words that start with 'dou'.
| doubleheader | doublenesses | doublespeaks | 
| doublethinks | doubtfulness | doughnutlike | 
| douroucoulis | ||
Note: These 7 12-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)