9 letter words:
febrifuge18,
7 letter words:
buffier15,
firebug13,
6 letter words:
buffer14,
rebuff14,
griffe13,
figure10,
refuge10,
burgee9,
5 letter words:
buffi13,
griff12,
gruff12,
fifer11,
ruffe11,
brief10,
fiber10,
fibre10,
grief9,
beige8,
giber8,
grebe8,
4 letter words:
biff12,
buff12,
guff11,
fief10,
fife10,
riff10,
ruff10,
beef9,
feeb9,
frig8,
frug8,
berg7,
brig7,
burg7,
fere7,
fire7,
free7,
gibe7,
grub7,
reef7,
reif7,
rife7,
beer6,
bier6,
bree6,
brie6,
rube6,
eger5,
gree5,
grue5,
urge5,
3 letter words:
eff9,
iff9,
fib8,
fub8,
fig7,
fug7,
beg6,
big6,
bug6,
fee6,
fer6,
feu6,
fie6,
fir6,
fur6,
gib6,
ref6,
rif6,
bee5,
bur5,
reb5,
rib5,
rub5,
urb5,
erg4,
gee4,
gie4,
reg4,
rig4,
rug4,
ere3,
ire3,
ree3,
rei3,
rue3,
2 letter words:
ef5,
fe5,
if5,
be4,
bi4,
er2,
re2,