There are 12 words that start with 'eccl'.
| ecclesia | ecclesiae | 
| ecclesial | ecclesiastic | 
| ecclesiology | ecclesiastics | 
| ecclesiastical | ecclesiologies | 
| ecclesiologist | ecclesiasticism | 
| ecclesiological | ecclesiologists | 
Note: These 12 words that start with 'eccl' are found from the USA & Canada version of the tournament Scrabble word list.