5 letter words:
feces10,
fices10,
4 letter words:
fice9,
fisc9,
fees7,
feis7,
seif7,
cees6,
ices6,
sice6,
3 letter words:
efs6,
fee6,
fes6,
fie6,
ifs6,
sif6,
cee5,
cis5,
ice5,
sec5,
sic5,
see3,
sei3,
2 letter words:
ef5,
fe5,
if5,
ee2,
es2,
is2,
si2,