7 letter words:
refuter10,
6 letter words:
kereru10,
ferret9,
feutre9,
refute9,
returf9,
ureter6,
5 letter words:
kurre9,
terek9,
ferer8,
freer8,
freet8,
frere8,
refer8,
terfe8,
truer5,
4 letter words:
keef11,
kerf11,
keet8,
kete8,
reek8,
reke8,
teek8,
trek8,
turk8,
feer7,
feet7,
fere7,
fete7,
free7,
fret7,
furr7,
reef7,
reft7,
terf7,
tref7,
turf7,
rete4,
ruer4,
teer4,
tree4,
true4,
3 letter words:
kef10,
eek7,
eke7,
erk7,
euk7,
ket7,
kue7,
uke7,
eft6,
erf6,
fee6,
fer6,
fet6,
feu6,
fur6,
ref6,
tef6,
ere3,
err3,
ree3,
ret3,
rue3,
rut3,
tee3,
ure3,
ute3,
2 letter words:
ef5,
fe5,
ee2,
er2,
et2,
re2,
te2,
ur2,
ut2,