There are 15 11-letter words that start with 'down'.
| downgrading | downhearted | downhillers | 
| downinesses | downlinking | downloading | 
| downplaying | downrightly | downscaling | 
| downshifted | downstaters | downstrokes | 
| downtowners | downtrended | downtrodden | 
Note: These 15 11-letter words that start with 'down' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with downs, downt, downl, downh, downp, downw, downb, downf, downr, downc, downi, downg, downz, downe, downd, downy.
5-letter words start with 'down' (2)