6 letter words:
reebok12,
before11,
5 letter words:
kefir12,
berko11,
biker11,
broke11,
brief10,
fiber10,
fibre10,
fibro10,
kiore9,
fiere8,
boree7,
4 letter words:
fike11,
firk11,
fork11,
keef11,
kerf11,
kief11,
berk10,
bike10,
birk10,
boke10,
bork10,
brik10,
kerb10,
kibe10,
beef9,
feeb9,
forb9,
frib9,
keir8,
kero8,
kier8,
kore8,
reek8,
reik8,
reke8,
roke8,
feer7,
fere7,
fier7,
fire7,
fore7,
free7,
froe7,
orfe7,
reef7,
reif7,
rife7,
beer6,
bere6,
bier6,
biro6,
bore6,
bree6,
brei6,
brie6,
brio6,
robe6,
3 letter words:
kef10,
kif10,
bok9,
keb9,
kob9,
fib8,
fob8,
eek7,
eik7,
eke7,
erk7,
irk7,
kir7,
koi7,
kor7,
oik7,
oke7,
rok7,
erf6,
fee6,
fer6,
fie6,
fir6,
foe6,
for6,
fro6,
orf6,
ref6,
rif6,
bee5,
bio5,
boi5,
bor5,
bro5,
obe5,
obi5,
orb5,
reb5,
rib5,
rob5,
ere3,
ire3,
ore3,
ree3,
rei3,
reo3,
roe3,
2 letter words:
ki6,
ko6,
ef5,
fe5,
if5,
of5,
be4,
bi4,
bo4,
ob4,
ee2,
er2,
io2,
oe2,
oi2,
or2,
re2,