There are 10 13-letter words that start with 'pref'.
| prefabricated | prefabricates |
| preferability | prefiguration |
| prefigurative | prefigurement |
| preformations | preformatting |
| preformulated | preformulates |
Note: These 10 13-letter words that start with 'pref' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with prefi, prefa, prefe, prefo, prefr, prefl, prefu.
6-letter words start with 'pref' (3)