7 letter words:
frigger12,
6 letter words:
rigger8,
5 letter words:
grief9,
firer8,
frier8,
rifer8,
rerig6,
4 letter words:
frig8,
fier7,
fire7,
reif7,
rife7,
grig6,
rigg6,
girr5,
3 letter words:
feg7,
fig7,
gif7,
erf6,
fer6,
fie6,
fir6,
ref6,
rif6,
egg5,
gig5,
igg5,
erg4,
gie4,
reg4,
rig4,
err3,
ire3,
rei3,
2 letter words:
ef5,
fe5,
if5,
gi3,
er2,
re2,