5 letter words:
biker11,
broke11,
4 letter words:
berk10,
bike10,
birk10,
bork10,
kerb10,
kibe10,
keir8,
kier8,
kore8,
bier6,
biro6,
bore6,
brie6,
brio6,
robe6,
3 letter words:
kob9,
irk7,
kir7,
koi7,
kor7,
oke7,
bio5,
bro5,
obe5,
obi5,
orb5,
reb5,
rib5,
rob5,
ire3,
ore3,
rei3,
roe3,
2 letter words:
ki6,
be4,
bi4,
bo4,
er2,
oe2,
oi2,
or2,
re2,