7 letter words:
tuftier10,
6 letter words:
fetter9,
fitter9,
refute9,
titfer9,
tufter9,
5 letter words:
fritt8,
fruit8,
refit8,
retie5,
tetri5,
titer5,
titre5,
trite5,
tutee5,
uteri5,
utter5,
4 letter words:
feet7,
fere7,
fete7,
fire7,
free7,
fret7,
frit7,
reef7,
reft7,
reif7,
rife7,
rift7,
tref7,
tuft7,
turf7,
etui4,
rete4,
rite4,
tier4,
tire4,
tree4,
tret4,
true4,
3 letter words:
eft6,
fee6,
fer6,
fet6,
feu6,
fie6,
fir6,
fit6,
fur6,
ref6,
rif6,
ere3,
ire3,
ree3,
rei3,
ret3,
rue3,
rut3,
tee3,
tet3,
tie3,
tit3,
tui3,
tut3,
ute3,
2 letter words:
ef5,
fe5,
if5,
er2,
et2,
it2,
re2,
ti2,
ut2,