There are 16 words that start with 'thorn'.
| thorn | thorns | thorny |
| thorned | thornier | thornily |
| thorning | thornback | thornbush |
| thorniest | thornless | thornlike |
| thornbacks | thorniness | thornbushes |
| thorninesses | ||
Note: These 16 words that start with 'thorn' are found from the USA & Canada version of the tournament Scrabble word list.