5 letter words:
brief10,
fiber10,
fibre10,
fiere8,
4 letter words:
beef9,
feeb9,
frib9,
feer7,
fere7,
fier7,
fire7,
free7,
reef7,
reif7,
rife7,
beer6,
bere6,
bier6,
bree6,
brei6,
brie6,
rube6,
iure4,
3 letter words:
fib8,
fub8,
erf6,
fee6,
fer6,
feu6,
fie6,
fir6,
fur6,
ref6,
rif6,
bee5,
bru5,
bur5,
reb5,
rib5,
rub5,
urb5,
ere3,
ire3,
ree3,
rei3,
rue3,
ure3,
2 letter words:
ef5,
fe5,
if5,
be4,
bi4,
ee2,
er2,
re2,
ur2,