Unscrambling PREFERS gives 56 words. PREFERS is the longest, and PREFERS scores the most at 12 points.
No other single word uses all 7 letters of PREFERS. PREFERS has 7 letters: 2 vowels and 5 consonants, worth 12 points before any board bonuses.
7-letter words 1
6-letter words 4
5-letter words 13
feres8freer8frees8frere8peers7perse7prees7prese7reefs8refer8serer5speer7spree7
4-letter words 16
errs4feer7fees7fere7free7peer6pees6pree6reef7rees4refs7reps6seep6seer4sere4serf7
3-letter words 15
efs6ere3err3ers3fee6fer6pee5per5pes5ree3ref6rep5res3see3ser3
2-letter words 7
ef5er2es2pe4ps4re2rs2
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.