4 letter words:
work11,
bork10,
bouk10,
burk10,
bowr9,
brow9,
koru8,
3 letter words:
kow10,
wok10,
bok9,
kob9,
bow8,
kor7,
ouk7,
rok7,
row6,
bor5,
bro5,
bru5,
bur5,
orb5,
rob5,
rub5,
urb5,
our3,
2 letter words:
ko6,
ow5,
wo5,
bo4,
ob4,
or2,
ou2,
ur2,