5 letter words:
bourg8,
4 letter words:
bork10,
bouk10,
burk10,
gouk9,
grok9,
koru8,
brog7,
burg7,
grub7,
3 letter words:
bok9,
kob9,
kor7,
ouk7,
rok7,
bog6,
bug6,
gob6,
gub6,
bor5,
bro5,
bru5,
bur5,
orb5,
rob5,
rub5,
urb5,
gor4,
gur4,
rug4,
our3,
2 letter words:
ko6,
bo4,
ob4,
go3,
gu3,
ug3,
or2,
ou2,
ur2,