There are 21 words that start with 'clay'.
| clay | clays | clayed |
| clayey | clayier | claying |
| clayish | claypan | claybank |
| clayiest | claylike | claymore |
| claypans | clayware | claybanks |
| claymores | claystone | claytonia |
| claywares | claystones | claytonias |
Note: These 21 words that start with 'clay' are found from the USA & Canada version of the tournament Scrabble word list.