There are 52 words hidden in the letters of PREFERRED, from 6 two-letter words up to PREFERRED (9 letters). For points, PREFERRED is best at 15.
No other single word uses all 9 letters of PREFERRED. PREFERRED has 9 letters: 3 vowels and 6 consonants, worth 15 points before any board bonuses.
9-letter words 1
8-letter words 2
deferrer12referred12
6-letter words 7
5-letter words 8
defer9erred6freed9freer8frere8preed8refed9refer8
4-letter words 15
deep7deer5dere5dree5epee6feed8feer7fere7free7peed7peer6pree6rede5reed5reef7
3-letter words 13
dee4ere3err3fed7fee6fer6ped6pee5per5red4ree3ref6rep5
2-letter words 6
de3ed3ef5er2pe4re2
Words are from our open word list and include some game-only words. Rude words are left out of this page; the unscrambler shows every valid word, lets you add blank tiles and filter by length.