6 letter words:
befret11,
bereft11,
5 letter words:
befit10,
brief10,
fiber10,
fibre10,
refit8,
beret7,
biter7,
tribe7,
retie5,
4 letter words:
beef9,
feeb9,
feet7,
fere7,
fete7,
fire7,
free7,
fret7,
frit7,
reef7,
reft7,
reif7,
rife7,
rift7,
tref7,
beer6,
beet6,
bier6,
bite6,
bree6,
brie6,
brit6,
rete4,
rite4,
tier4,
tire4,
tree4,
3 letter words:
fib8,
eft6,
fee6,
fer6,
fet6,
fie6,
fir6,
fit6,
ref6,
rif6,
bee5,
bet5,
bit5,
reb5,
rib5,
ere3,
ire3,
ree3,
rei3,
ret3,
tee3,
tie3,
2 letter words:
ef5,
fe5,
if5,
be4,
bi4,
er2,
et2,
it2,
re2,
ti2,