8 letter words:
returner8,
7 letter words:
refuter10,
6 letter words:
ferret9,
refute9,
unfree9,
neuter6,
renter6,
rerent6,
retune6,
return6,
tenure6,
tureen6,
turner6,
ureter6,
5 letter words:
freer8,
frere8,
refer8,
enter5,
enure5,
rente5,
rerun5,
terne5,
treen5,
truer5,
tuner5,
4 letter words:
enuf7,
feet7,
fere7,
fern7,
fete7,
free7,
fret7,
reef7,
reft7,
tref7,
turf7,
erne4,
rent4,
rete4,
ruer4,
rune4,
runt4,
teen4,
tern4,
tree4,
true4,
tune4,
turn4,
3 letter words:
eft6,
fee6,
fen6,
fer6,
fet6,
feu6,
fun6,
fur6,
ref6,
ere3,
ern3,
err3,
nee3,
net3,
nut3,
ree3,
ret3,
rue3,
run3,
rut3,
tee3,
ten3,
tun3,
urn3,
ute3,
2 letter words:
ef5,
fe5,
en2,
er2,
et2,
ne2,
nu2,
re2,
un2,
ut2,