5 letter words:
feres8,
frees8,
reefs8,
egers6,
grees6,
reges6,
serge6,
4 letter words:
fees7,
fere7,
free7,
reef7,
refs7,
serf7,
eger5,
ergs5,
gees5,
gree5,
regs5,
rees4,
seer4,
sere4,
3 letter words:
efs6,
fee6,
fer6,
fes6,
ref6,
erg4,
gee4,
reg4,
seg4,
ere3,
ers3,
ree3,
res3,
see3,
ser3,
2 letter words:
ef5,
fe5,
er2,
es2,
re2,