5 letter words:
grief9,
4 letter words:
frig8,
fere7,
fire7,
free7,
reef7,
reif7,
rife7,
eger5,
gree5,
3 letter words:
fig7,
fee6,
fer6,
fie6,
fir6,
ref6,
rif6,
erg4,
gee4,
gie4,
reg4,
rig4,
ere3,
ire3,
ree3,
rei3,
2 letter words:
ef5,
fe5,
if5,
er2,
re2,