There are 18 words that start with 'tire'.
| tire | tired |
| tires | tireder |
| tiredly | tiredest |
| tireless | tiresome |
| tiredness | tirewoman |
| tirewomen | tirelessly |
| tiresomely | tirednesses |
| tirelessness | tiresomeness |
| tirelessnesses | tiresomenesses |
Note: These 18 words that start with 'tire' are found from the USA & Canada version of the tournament Scrabble word list.