There are 12 words that start with 'leth'.
| lethe | lethal |
| lethes | lethals |
| lethean | lethally |
| lethargy | lethality |
| lethargic | lethargies |
| lethalities | lethargically |
Note: These 12 words that start with 'leth' are found from the USA & Canada version of the tournament Scrabble word list.