5 letter words:
spred8,
4 letter words:
feds8,
peds7,
refs7,
serf7,
sped7,
reps6,
reds5,
3 letter words:
def7,
fed7,
efs6,
erf6,
fer6,
fes6,
ped6,
ref6,
per5,
pes5,
pre5,
rep5,
eds4,
red4,
sed4,
ers3,
res3,
ser3,
2 letter words:
ef5,
fe5,
pe4,
de3,
ed3,
er2,
es2,
re2,