There are 12 words that start with 'siph'.
| siphon | siphons |
| siphonal | siphoned |
| siphonic | siphonage |
| siphoning | siphonages |
| siphonophore | siphonostele |
| siphonophores | siphonosteles |
Note: These 12 words that start with 'siph' are found from the USA & Canada version of the tournament Scrabble word list.