5 letter words:
brief10,
fiber10,
fibre10,
4 letter words:
frib9,
fier7,
fire7,
reif7,
rife7,
bier6,
brei6,
brie6,
rube6,
iure4,
3 letter words:
fib8,
fub8,
erf6,
fer6,
feu6,
fie6,
fir6,
fur6,
ref6,
rif6,
bru5,
bur5,
reb5,
rib5,
rub5,
urb5,
ire3,
rei3,
rue3,
ure3,
2 letter words:
ef5,
fe5,
if5,
be4,
bi4,
er2,
re2,
ur2,