There are 11 words that start with 'claus'.
| clause | clausal |
| clauses | claustra |
| claustral | claustrum |
| claustrophobe | claustrophobes |
| claustrophobia | claustrophobic |
| claustrophobias | |
Note: These 11 words that start with 'claus' are found from the USA & Canada version of the tournament Scrabble word list.