There are 12 words that start with 'ureth'.
| urethan | urethra |
| urethane | urethans |
| urethrae | urethral |
| urethras | urethanes |
| urethritis | urethritises |
| urethroscope | urethroscopes |
Note: These 12 words that start with 'ureth' are found from the USA & Canada version of the tournament Scrabble word list.