6 letter words:
befret11,
bereft11,
5 letter words:
kefir12,
biker11,
fifer11,
befit10,
brief10,
fiber10,
fibre10,
kiter9,
trike9,
refit8,
beret7,
biter7,
tribe7,
retie5,
4 letter words:
biff12,
keef11,
kerf11,
kief11,
berk10,
bike10,
birk10,
fief10,
fife10,
kerb10,
kibe10,
riff10,
teff10,
tiff10,
beef9,
feeb9,
keet8,
keir8,
kier8,
kite8,
reek8,
tike8,
trek8,
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:
kef10,
kif10,
eff9,
iff9,
fib8,
eek7,
eke7,
irk7,
kir7,
kit7,
eft6,
fee6,
fer6,
fet6,
fie6,
fir6,
fit6,
ref6,
rif6,
bee5,
bet5,
bit5,
reb5,
rib5,
ere3,
ire3,
ree3,
rei3,
ret3,
tee3,
tie3,
2 letter words:
ki6,
ef5,
fe5,
if5,
be4,
bi4,
er2,
et2,
it2,
re2,
ti2,