There are 13 words that start with 'hypost'.
| hypostome | hypostyle | 
| hypostases | hypostasis | 
| hypostatic | hypostomes | 
| hypostyles | hypostatize | 
| hypostatized | hypostatizes | 
| hypostatizing | hypostatically | 
| hypostatization | |
Note: These 13 words that start with 'hypost' are found from the USA & Canada version of the tournament Scrabble word list.