There are 14 words that start with 'exis'.
| exist | exists | 
| existed | existent | 
| existing | existence | 
| existents | existences | 
| existential | existentially | 
| existentialism | existentialist | 
| existentialisms | existentialists | 
Note: These 14 words that start with 'exis' are found from the USA & Canada version of the tournament Scrabble word list.