5 letter words:
keefs12,
kerfs12,
esker9,
reeks9,
feres8,
frees8,
reefs8,
4 letter words:
keef11,
kefs11,
kerf11,
ekes8,
reek8,
seek8,
skee8,
fees7,
fere7,
free7,
reef7,
refs7,
serf7,
rees4,
seer4,
sere4,
3 letter words:
kef10,
eek7,
eke7,
efs6,
fee6,
fer6,
fes6,
ref6,
ere3,
ers3,
ree3,
res3,
see3,
ser3,
2 letter words:
ef5,
fe5,
er2,
es2,
re2,