There are 11 words that start with 'sphi'.
| sphinx | sphinges | sphingid |
| sphinxes | sphincter | sphingids |
| sphincters | sphinxlike | sphincteric |
| sphingosine | sphingosines | |
Note: These 11 words that start with 'sphi' are found from the USA & Canada version of the tournament Scrabble word list.