5 letter words:
fetus8,
frets8,
frust8,
terfs8,
turfs8,
sture5,
trues5,
4 letter words:
efts7,
fest7,
fets7,
feus7,
fret7,
furs7,
fuse7,
fust7,
refs7,
reft7,
serf7,
surf7,
tefs7,
terf7,
tref7,
turf7,
erst4,
rest4,
rets4,
rues4,
ruse4,
rust4,
ruts4,
suer4,
suet4,
sure4,
tres4,
true4,
ures4,
user4,
utes4,
3 letter words:
efs6,
eft6,
erf6,
fer6,
fes6,
fet6,
feu6,
fur6,
ref6,
tef6,
ers3,
est3,
res3,
ret3,
rue3,
rut3,
ser3,
set3,
sue3,
sur3,
tes3,
ure3,
use3,
ute3,
uts3,
2 letter words:
ef5,
fe5,
er2,
es2,
et2,
re2,
st2,
te2,
ur2,
us2,
ut2,