8 letter words:
ferreter11,
referent11,
7 letter words:
referee10,
enterer7,
reenter7,
terreen7,
terrene7,
6 letter words:
ferret9,
reefer9,
entree6,
eterne6,
rennet6,
renter6,
rerent6,
retene6,
teener6,
tenner6,
5 letter words:
freer8,
frere8,
refer8,
enter5,
rente5,
terne5,
treen5,
4 letter words:
feet7,
fere7,
fern7,
fete7,
free7,
fret7,
reef7,
reft7,
tref7,
erne4,
nene4,
rent4,
rete4,
teen4,
tern4,
tree4,
3 letter words:
eft6,
fee6,
fen6,
fer6,
fet6,
ref6,
ere3,
ern3,
err3,
nee3,
net3,
ree3,
ret3,
tee3,
ten3,
2 letter words:
ef5,
fe5,
en2,
er2,
et2,
ne2,
re2,