6 letter words:
fetter9,
getter7,
5 letter words:
egger7,
egret6,
greet6,
4 letter words:
feet7,
fere7,
fete7,
free7,
fret7,
reef7,
reft7,
tref7,
tegg6,
eger5,
gree5,
rete4,
tree4,
tret4,
3 letter words:
eft6,
fee6,
fer6,
fet6,
ref6,
egg5,
erg4,
gee4,
get4,
reg4,
teg4,
ere3,
ree3,
ret3,
tee3,
tet3,
2 letter words:
ef5,
fe5,
er2,
et2,
re2,