There are 18 words that start with 'clau'.
| clause | claucht |
| claught | clausal |
| clauses | claughts |
| claustra | claughted |
| claustral | claustrum |
| claughting | claudication |
| claudications | claustrophobe |
| claustrophobes | claustrophobia |
| claustrophobic | claustrophobias |
Note: These 18 words that start with 'clau' are found from the USA & Canada version of the tournament Scrabble word list.