There are 20 words that start with 'hast'.
| hast | haste | hasty |
| hasted | hasten | hastes |
| hastate | hastens | hastier |
| hastily | hasting | hasteful |
| hastened | hastener | hastiest |
| hastately | hasteners | hastening |
| hastiness | hastinesses | |
Note: These 20 words that start with 'hast' are found from the USA & Canada version of the tournament Scrabble word list.