There are 12 words that start with 'convu'.
| convulse | convulsed | 
| convulses | convulsant | 
| convulsing | convulsion | 
| convulsive | convulsants | 
| convulsions | convulsively | 
| convulsionary | convulsiveness | 
Note: These 12 words that start with 'convu' are found from the USA & Canada version of the tournament Scrabble word list.