5 letter words:
krubi11,
4 letter words:
birk10,
bork10,
bouk10,
brik10,
buik10,
burk10,
bubo8,
burb8,
koru8,
kuri8,
biro6,
brio6,
3 letter words:
bok9,
kob9,
bib7,
bob7,
bub7,
irk7,
kir7,
koi7,
kor7,
oik7,
ouk7,
rok7,
bio5,
boi5,
bor5,
bro5,
bru5,
bur5,
obi5,
orb5,
rib5,
rob5,
rub5,
urb5,
our3,
2 letter words:
ki6,
ko6,
bi4,
bo4,
ob4,
io2,
oi2,
or2,
ou2,
ur2,