7 letter words:
fruiter10,
turfier10,
runtier7,
6 letter words:
return6,
ruiner6,
triune6,
turner6,
uniter6,
5 letter words:
feint8,
finer8,
firer8,
frier8,
fruit8,
infer8,
refit8,
rifer8,
unfit8,
inert5,
inter5,
inure5,
niter5,
nitre5,
rerun5,
rutin5,
trier5,
trine5,
truer5,
tuner5,
unite5,
untie5,
urine5,
uteri5,
4 letter words:
enuf7,
fern7,
fine7,
fire7,
firn7,
fret7,
frit7,
neif7,
reft7,
reif7,
rife7,
rift7,
tref7,
turf7,
etui4,
nite4,
rein4,
rent4,
rite4,
ruer4,
ruin4,
rune4,
runt4,
tern4,
tier4,
tine4,
tire4,
true4,
tune4,
turn4,
unit4,
3 letter words:
eft6,
fen6,
fer6,
fet6,
feu6,
fie6,
fin6,
fir6,
fit6,
fun6,
fur6,
ref6,
rif6,
ern3,
err3,
ire3,
net3,
nit3,
nut3,
rei3,
ret3,
rin3,
rue3,
run3,
rut3,
ten3,
tie3,
tin3,
tui3,
tun3,
urn3,
ute3,
2 letter words:
ef5,
fe5,
if5,
en2,
er2,
et2,
in2,
it2,
ne2,
nu2,
re2,
ti2,
un2,
ut2,