6 letter words:
fitter9,
titfer9,
retint6,
tinter6,
5 letter words:
feint8,
finer8,
fritt8,
infer8,
refit8,
inert5,
inter5,
niter5,
nitre5,
tetri5,
titer5,
titre5,
trine5,
trite5,
4 letter words:
fern7,
fine7,
fire7,
firn7,
fret7,
frit7,
neif7,
reft7,
reif7,
rife7,
rift7,
tref7,
nett4,
nite4,
rein4,
rent4,
rite4,
tent4,
tern4,
tier4,
tine4,
tint4,
tire4,
tret4,
3 letter words:
eft6,
fen6,
fer6,
fet6,
fie6,
fin6,
fir6,
fit6,
ref6,
rif6,
ern3,
ire3,
net3,
nit3,
rei3,
ret3,
rin3,
ten3,
tet3,
tie3,
tin3,
tit3,
2 letter words:
ef5,
fe5,
if5,
en2,
er2,
et2,
in2,
it2,
ne2,
re2,
ti2,