5 letter words:
kombu13,
rumbo9,
4 letter words:
bork10,
bouk10,
burk10,
murk10,
borm8,
koru8,
ombu8,
umbo8,
roum6,
3 letter words:
bok9,
kob9,
bum7,
kor7,
mob7,
ouk7,
rok7,
bor5,
bro5,
bru5,
bur5,
mor5,
mou5,
orb5,
rob5,
rom5,
rub5,
rum5,
urb5,
our3,
2 letter words:
ko6,
bo4,
mo4,
mu4,
ob4,
om4,
um4,
or2,
ou2,
ur2,