6 letter words:
figure10,
5 letter words:
kefir12,
grief9,
4 letter words:
kerf11,
kief11,
kufi11,
frig8,
frug8,
keir8,
kier8,
fire7,
reif7,
rife7,
grue5,
urge5,
3 letter words:
kef10,
kif10,
keg8,
fig7,
fug7,
irk7,
kir7,
kue7,
uke7,
fer6,
feu6,
fie6,
fir6,
fur6,
ref6,
rif6,
erg4,
gie4,
reg4,
rig4,
rug4,
ire3,
rei3,
rue3,
2 letter words:
ki6,
ef5,
fe5,
if5,
er2,
re2,