There are 15 words that start with 'duct'.
| duct | ducts | ductal |
| ducted | ductile | ducting |
| ductule | ductings | ductless |
| ductules | ductwork | ductilely |
| ductility | ductworks | ductilities |
Note: These 15 words that start with 'duct' are found from the USA & Canada version of the tournament Scrabble word list.