9 letter words:
forgiving17,
7 letter words:
forging12,
6 letter words:
giving11,
firing10,
riving10,
roving10,
virgin10,
virion9,
goring8,
gringo8,
origin7,
5 letter words:
gonif9,
vigor9,
going7,
giron6,
groin6,
iring6,
4 letter words:
frig8,
frog8,
fino7,
firn7,
foin7,
info7,
vino7,
gong6,
grig6,
grog6,
nogg6,
girn5,
giro5,
grin5,
ring5,
inro4,
iron4,
noir4,
nori4,
3 letter words:
fig7,
fog7,
vig7,
fin6,
fir6,
fon6,
for6,
fro6,
rif6,
gig5,
igg5,
gin4,
gor4,
nog4,
rig4,
ion3,
nor3,
rin3,
2 letter words:
if5,
of5,
go3,
in2,
no2,
oi2,
on2,
or2,
