5 letter words:
skiff15,
kiefs12,
fiefs11,
fifes11,
4 letter words:
kefs11,
kief11,
kifs11,
effs10,
fief10,
fife10,
sike8,
seif7,
3 letter words:
kef10,
kif10,
eff9,
iff9,
kis7,
ski7,
efs6,
fes6,
fie6,
ifs6,
sei3,
2 letter words:
ki6,
ef5,
fe5,
if5,
es2,
is2,
si2,