5 letter words:
frets8,
teggs7,
4 letter words:
efts7,
fest7,
fets7,
fret7,
refs7,
reft7,
serf7,
tref7,
eggs6,
tegg6,
ergs5,
gest5,
gets5,
regs5,
tegs5,
erst4,
rest4,
rets4,
tres4,
3 letter words:
efs6,
eft6,
fer6,
fes6,
fet6,
ref6,
egg5,
erg4,
get4,
reg4,
seg4,
teg4,
ers3,
res3,
ret3,
ser3,
set3,
2 letter words:
ef5,
fe5,
er2,
es2,
et2,
re2,