5 letter words:
fiefs11,
fifes11,
sniff11,
fines8,
neifs8,
nines5,
4 letter words:
effs10,
fief10,
fife10,
fens7,
fine7,
fins7,
neif7,
seif7,
inns4,
nine4,
sine4,
3 letter words:
eff9,
iff9,
efs6,
fen6,
fes6,
fie6,
fin6,
ifs6,
ens3,
inn3,
ins3,
sei3,
sen3,
sin3,
2 letter words:
ef5,
fe5,
if5,
en2,
es2,
in2,
is2,
ne2,
si2,