8 letter words:
infeoffs17,
7 letter words:
infeoff16,
6 letter words:
feoffs15,
5 letter words:
feoff14,
fiefs11,
fifes11,
sniff11,
fines8,
finos8,
foins8,
infos8,
neifs8,
eosin5,
noise5,
4 letter words:
effs10,
fief10,
fife10,
offs10,
fens7,
fine7,
fino7,
fins7,
foes7,
foin7,
fons7,
info7,
neif7,
seif7,
eons4,
ions4,
noes4,
nose4,
ones4,
sine4,
sone4,
3 letter words:
eff9,
iff9,
off9,
efs6,
fen6,
fes6,
fie6,
fin6,
foe6,
fon6,
ifs6,
ens3,
eon3,
ins3,
ion3,
nos3,
oes3,
one3,
ons3,
ose3,
sei3,
sen3,
sin3,
son3,
2 letter words:
ef5,
fe5,
if5,
of5,
en2,
es2,
in2,
is2,
ne2,
no2,
oe2,
oi2,
on2,
os2,
si2,
so2,