5 letter words:
refit8,
retie5,
4 letter words:
feet7,
fere7,
fete7,
fire7,
free7,
fret7,
frit7,
reef7,
reft7,
reif7,
rife7,
rift7,
tref7,
rete4,
rite4,
tier4,
tire4,
tree4,
3 letter words:
eft6,
fee6,
fer6,
fet6,
fie6,
fir6,
fit6,
ref6,
rif6,
ere3,
ire3,
ree3,
rei3,
ret3,
tee3,
tie3,
2 letter words:
ef5,
fe5,
if5,
er2,
et2,
it2,
re2,
ti2,