11 letter words:
unpreferred17,
9 letter words:
preferred15,
8 letter words:
deferrer12,
referred12,
refunder12,
unpeered11,
renderer9,
7 letter words:
prefund13,
enfreed11,
unfreed11,
eperdue10,
perdure10,
preened10,
repured10,
preener9,
endurer8,
6 letter words:
prefer11,
feeder10,
feered10,
fender10,
funder10,
furder10,
furred10,
reefed10,
refeed10,
refund10,
unfeed10,
deepen9,
deeper9,
enfree9,
eperdu9,
peened9,
peered9,
perdue9,
pruned9,
puered9,
pureed9,
purred9,
reefer9,
unfree9,
pruner8,
repure8,
endure7,
enured7,
needer7,
reeden7,
reeder7,
render7,
5 letter words:
defer9,
feued9,
freed9,
refed9,
unfed9,
drupe8,
duper8,
ferer8,
freer8,
frere8,
pendu8,
pened8,
perdu8,
preed8,
prude8,
pured8,
refer8,
upend8,
urped8,
neper7,
preen7,
prune7,
puree7,
purer7,
rupee7,
deere6,
drere6,
ender6,
endue6,
erned6,
erred6,
nuder6,
reede6,
ruder6,
runed6,
undee6,
under6,
unred6,
urdee6,
urned6,
enure5,
rerun5,
4 letter words:
feed8,
fend8,
feud8,
fund8,
deep7,
dupe7,
enuf7,
feen7,
feer7,
fere7,
fern7,
free7,
furr7,
peed7,
pend7,
reef7,
epee6,
neep6,
peen6,
peer6,
pene6,
pere6,
pern6,
pree6,
puer6,
pure6,
purr6,
rurp6,
deen5,
deer5,
dene5,
dere5,
dern5,
dree5,
dune5,
dure5,
durn5,
durr5,
ered5,
need5,
nerd5,
nude5,
nurd5,
rede5,
reed5,
rend5,
rude5,
rued5,
rund5,
unde5,
urde5,
erne4,
nurr4,
reen4,
ruer4,
rune4,
3 letter words:
def7,
fed7,
fud7,
dup6,
erf6,
fee6,
fen6,
fer6,
feu6,
fun6,
fur6,
nef6,
ped6,
pud6,
ref6,
nep5,
pee5,
pen5,
per5,
pre5,
pun5,
pur5,
rep5,
urp5,
dee4,
den4,
due4,
dun4,
end4,
ned4,
red4,
rud4,
urd4,
een3,
ene3,
ere3,
ern3,
err3,
nee3,
nur3,
ree3,
ren3,
rue3,
run3,
ure3,
urn3,
2 letter words:
ef5,
fe5,
pe4,
up4,
de3,
ed3,
ee2,
en2,
er2,
ne2,
nu2,
re2,
un2,
ur2,
