There are 13 words that start with 'stain'.
| stain | stains | 
| stained | stainer | 
| stainers | staining | 
| stainable | stainless | 
| stainproof | stainlesses | 
| stainlessly | stainability | 
| stainabilities | |
Note: These 13 words that start with 'stain' are found from the USA & Canada version of the tournament Scrabble word list.