There are 12 words that end with 'ecium'.
| aecium | zoecium | gynecium |
| lutecium | zooecium | gynaecium |
| gynoecium | androecium | apothecium |
| paramecium | endothecium | perithecium |
Note: These 12 words that end with 'ecium' are found from the USA & Canada version of the tournament Scrabble word list.