5 letter words:
fifer11,
offer11,
brief10,
fiber10,
fibre10,
4 letter words:
biff12,
boff12,
fief10,
fife10,
riff10,
forb9,
fire7,
fore7,
froe7,
reif7,
rife7,
bier6,
biro6,
bore6,
brie6,
brio6,
robe6,
3 letter words:
eff9,
iff9,
off9,
fib8,
fob8,
fer6,
fie6,
fir6,
foe6,
for6,
fro6,
ref6,
rif6,
bio5,
bro5,
obe5,
obi5,
orb5,
reb5,
rib5,
rob5,
ire3,
ore3,
rei3,
roe3,
2 letter words:
ef5,
fe5,
if5,
of5,
be4,
bi4,
bo4,
er2,
oe2,
oi2,
or2,
re2,