There are 15 words that start with 'metha'.
| methane | methadon |
| methanes | methanol |
| methadone | methadons |
| methanols | methadones |
| methanation | methacrylate |
| methanations | methaqualone |
| methacrylates | methaqualones |
| methamphetamine | |
Note: These 15 words that start with 'metha' are found from the USA & Canada version of the tournament Scrabble word list.