There are 11 words that start with 'catac'.
| catacomb | cataclysm |
| catacombs | cataclysms |
| catachreses | catachresis |
| cataclysmal | cataclysmic |
| catachrestic | catachrestical |
| cataclysmically | |
Note: These 11 words that start with 'catac' are found from the USA & Canada version of the tournament Scrabble word list.