There are 16 words that start with 'ecum'.
| ecumenic | ecumenics |
| ecumenism | ecumenist |
| ecumenical | ecumenisms |
| ecumenists | ecumenicism |
| ecumenicist | ecumenicity |
| ecumenically | ecumenicisms |
| ecumenicists | ecumenicalism |
| ecumenicities | ecumenicalisms |
Note: These 16 words that start with 'ecum' are found from the USA & Canada version of the tournament Scrabble word list.