5 letter words:
frigs9,
frogs9,
giros6,
4 letter words:
figs8,
fogs8,
frig8,
frog8,
firs7,
rifs7,
giro5,
rigs5,
sori4,
3 letter words:
fig7,
fog7,
fir6,
for6,
fro6,
ifs6,
rif6,
gor4,
gos4,
rig4,
ors3,
sir3,
sri3,
2 letter words:
if5,
of5,
go3,
is2,
oi2,
or2,
os2,
si2,
so2,