There are 14 words that start with 'seven'.
| seven | sevens | seventh | 
| seventy | sevenths | sevenfold | 
| seventeen | seventhly | seventies | 
| seventeens | seventieth | seventeenth | 
| seventieths | seventeenths | |
Note: These 14 words that start with 'seven' are found from the USA & Canada version of the tournament Scrabble word list.