There are 15 words that start with 'dual'.
| dual | duals | 
| dually | dualism | 
| dualist | duality | 
| dualize | dualisms | 
| dualists | dualized | 
| dualizes | dualistic | 
| dualities | dualizing | 
| dualistically | |
Note: These 15 words that start with 'dual' are found from the USA & Canada version of the tournament Scrabble word list.