10 letter words:
frigorific19,
5 letter words:
griff12,
corgi8,
orgic8,
cirri7,
rigor6,
4 letter words:
coff12,
riff10,
coif9,
corf9,
fico9,
foci9,
frig8,
frog8,
coir6,
giro5,
3 letter words:
iff9,
off9,
fig7,
fog7,
cig6,
cog6,
fir6,
for6,
fro6,
rif6,
cor5,
orc5,
roc5,
gor4,
rig4,
2 letter words:
if5,
of5,
go3,
oi2,
or2,