7 letter words:
ferrite10,
rotifer10,
6 letter words:
ferret9,
forrit9,
refire9,
retire6,
retore6,
rioter6,
5 letter words:
fetor8,
firer8,
forte8,
freer8,
frere8,
frier8,
frore8,
ofter8,
refer8,
refit8,
rifer8,
retie5,
retro5,
trier5,
4 letter words:
feet7,
fere7,
fete7,
fire7,
fore7,
fort7,
free7,
fret7,
frit7,
froe7,
reef7,
reft7,
reif7,
rife7,
rift7,
tref7,
rete4,
riot4,
rite4,
rote4,
roti4,
tier4,
tire4,
tiro4,
tore4,
tori4,
torr4,
tree4,
trio4,
3 letter words:
eft6,
fee6,
fer6,
fet6,
fie6,
fir6,
fit6,
foe6,
for6,
fro6,
oft6,
ref6,
rif6,
ere3,
err3,
ire3,
ore3,
ort3,
ree3,
rei3,
ret3,
roe3,
rot3,
tee3,
tie3,
toe3,
tor3,
2 letter words:
ef5,
fe5,
if5,
of5,
er2,
et2,
it2,
oe2,
oi2,
or2,
re2,
ti2,
to2,