7 letter words:
fiercer12,
6 letter words:
ferric11,
fierce11,
forcer11,
refire9,
corrie8,
orrice8,
5 letter words:
force10,
firer8,
freer8,
frere8,
frier8,
frore8,
refer8,
rifer8,
corer7,
crier7,
crore7,
ricer7,
4 letter words:
coif9,
corf9,
fice9,
fico9,
foci9,
fere7,
fire7,
fore7,
free7,
froe7,
reef7,
reif7,
rife7,
cere6,
cero6,
cire6,
coir6,
core6,
rice6,
3 letter words:
fee6,
fer6,
fie6,
fir6,
foe6,
for6,
fro6,
ref6,
rif6,
cee5,
cor5,
ice5,
orc5,
rec5,
roc5,
ere3,
err3,
ire3,
ore3,
ree3,
rei3,
roe3,
2 letter words:
ef5,
fe5,
if5,
of5,
er2,
oe2,
oi2,
or2,
re2,