There are 15 words that start with 'downl'.
| downland | downless | downlike | 
| downlink | download | downlands | 
| downlight | downlinks | downloads | 
| downlights | downlinked | downloaded | 
| downlinking | downloading | downloadable | 
Note: These 15 words that start with 'downl' are found from the USA & Canada version of the tournament Scrabble word list.