There are 18 words that start with 'prett'.
| pretty | prettied |
| prettier | pretties |
| prettify | prettily |
| prettiest | prettying |
| prettyish | prettified |
| prettifier | prettifies |
| prettiness | prettifiers |
| prettifying | prettinesses |
| prettification | prettifications |
Note: These 18 words that start with 'prett' are found from the USA & Canada version of the tournament Scrabble word list.