There are 9 words that start with 'archdu'.
| archduke | archducal |
| archduchy | archdukes |
| archduchess | archduchies |
| archdukedom | archdukedoms |
| archduchesses | |
Note: These 9 words that start with 'archdu' are found from the USA & Canada version of the tournament Scrabble word list.