There are 11 words that start with 'then'.
| then | thens |
| thenal | thenar |
| thence | thenage |
| thenars | thenages |
| thenceforth | thenceforward |
| thenceforwards | |
Note: These 11 words that start with 'then' are found from the USA & Canada version of the tournament Scrabble word list.