There are 8 12-letter words that start with 'pref'.
| prefabricate | preferential | prefinancing |
| preflighting | prefocussing | preformation |
| preformatted | preformulate | |
Note: These 8 12-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)