There are 11 words that start with 'sphen'.
| sphene | sphenes | sphenic |
| sphenoid | sphenodon | sphenoids |
| sphenodons | sphenodont | sphenoidal |
| sphenopsid | sphenopsids | |
Note: These 11 words that start with 'sphen' are found from the USA & Canada version of the tournament Scrabble word list.