5 letter words:
brief10,
fermi10,
fiber10,
fibre10,
4 letter words:
firm9,
berm8,
brim8,
fire7,
reif7,
rife7,
bier6,
brie6,
emir6,
mire6,
miri6,
rime6,
3 letter words:
fem8,
fib8,
mib7,
fer6,
fie6,
fir6,
ref6,
rif6,
mir5,
reb5,
rem5,
rib5,
rim5,
ire3,
rei3,
2 letter words:
ef5,
fe5,
if5,
be4,
bi4,
em4,
me4,
mi4,
er2,
re2,