There are 10 words that start with 'horses'.
| horses | horseshit | horseshod | 
| horseshoe | horseshits | horseshoed | 
| horseshoer | horseshoes | horseshoers | 
| horseshoeing | ||
Note: These 10 words that start with 'horses' are found from the USA & Canada version of the tournament Scrabble word list.