There are 15 11-letter words that start with 'pref'.
| prefectural | prefectures | preferences |
| preferments | prefiguring | prefinanced |
| prefinances | preflighted | prefocusing |
| prefocussed | prefocusses | prefranking |
| prefreezing | prefreshman | prefrontals |
Note: These 15 11-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)