10 letter words:
infeoffing20,
8 letter words:
feoffing18,
7 letter words:
infeoff16,
niffing14,
foining11,
6 letter words:
effing13,
fifing13,
goniff13,
offing13,
fining10,
ingine7,
5 letter words:
feoff14,
feign9,
fogie9,
gonef9,
gonif9,
ennog6,
genii6,
inion5,
4 letter words:
goff11,
fief10,
fife10,
fifi10,
niff10,
figo8,
feni7,
fine7,
fini7,
fino7,
foen7,
foin7,
fone7,
info7,
neif7,
nief7,
nife7,
gien5,
ginn5,
gone5,
ingo5,
nong5,
neon4,
nine4,
none4,
noni4,
onie4,
3 letter words:
eff9,
iff9,
off9,
feg7,
fig7,
fog7,
gif7,
fen6,
fie6,
fin6,
foe6,
fon6,
nef6,
ego4,
eng4,
gen4,
geo4,
gie4,
gin4,
gio4,
goe4,
gon4,
neg4,
nog4,
eon3,
inn3,
ion3,
nie3,
non3,
one3,
2 letter words:
ef5,
fe5,
if5,
of5,
gi3,
go3,
en2,
in2,
io2,
ne2,
no2,
oe2,
oi2,
on2,
