There are 17 words that start with 'discu'.
| discus | discuss | 
| discuses | discussed | 
| discusser | discusses | 
| discursive | discussant | 
| discussers | discussing | 
| discussion | discussable | 
| discussants | discussible | 
| discussions | discursively | 
| discursiveness | |
Note: These 17 words that start with 'discu' are found from the USA & Canada version of the tournament Scrabble word list.