There are 12 words that start with 'orthod'.
| orthodox | orthodoxy |
| orthodoxes | orthodoxly |
| orthodontia | orthodontic |
| orthodoxies | orthodontias |
| orthodontics | orthodontist |
| orthodontists | orthodontically |
Note: These 12 words that start with 'orthod' are found from the USA & Canada version of the tournament Scrabble word list.