8 letter words:
fetterer11,
7 letter words:
fretter10,
6 letter words:
ferret9,
fetter9,
reefer9,
teeter6,
terete6,
terret6,
5 letter words:
freer8,
frere8,
refer8,
4 letter words:
feet7,
fere7,
fete7,
free7,
fret7,
reef7,
reft7,
tref7,
rete4,
tree4,
tret4,
3 letter words:
eft6,
fee6,
fer6,
fet6,
ref6,
ere3,
err3,
ree3,
ret3,
tee3,
tet3,
2 letter words:
ef5,
fe5,
er2,
et2,
re2,