8 letter words:
referees11,
7 letter words:
reefers10,
referee10,
6 letter words:
freers9,
freres9,
reefer9,
refers9,
serger7,
5 letter words:
feres8,
freer8,
frees8,
frere8,
reefs8,
refer8,
egers6,
geese6,
grees6,
reges6,
serge6,
resee5,
serer5,
4 letter words:
effs10,
fees7,
fere7,
free7,
reef7,
refs7,
serf7,
eger5,
ergs5,
gees5,
gree5,
regs5,
errs4,
rees4,
seer4,
sere4,
3 letter words:
eff9,
efs6,
fee6,
fer6,
fes6,
ref6,
erg4,
gee4,
reg4,
seg4,
ere3,
err3,
ers3,
ree3,
res3,
see3,
ser3,
2 letter words:
ef5,
fe5,
er2,
es2,
re2,