7 letter words:
coffing16,
6 letter words:
coffin14,
goniff13,
offing13,
5 letter words:
gonif9,
coign8,
incog8,
4 letter words:
coff12,
coif9,
fico9,
foci9,
fino7,
foin7,
info7,
cion6,
coin6,
coni6,
icon6,
3 letter words:
iff9,
off9,
fig7,
fog7,
cig6,
cog6,
fin6,
fon6,
con5,
gin4,
nog4,
ion3,
2 letter words:
if5,
of5,
go3,
in2,
no2,
oi2,
on2,
