5 letter words:
brook11,
brool7,
buroo7,
4 letter words:
boko10,
book10,
bork10,
bouk10,
bulk10,
burk10,
kobo10,
kolo8,
koro8,
koru8,
look8,
lurk8,
oulk8,
rook8,
blur6,
bolo6,
bool6,
boor6,
broo6,
burl6,
lobo6,
obol6,
loor4,
lour4,
roul4,
3 letter words:
bok9,
kob9,
kor7,
ouk7,
rok7,
boo5,
bor5,
bro5,
bru5,
bur5,
lob5,
obo5,
orb5,
rob5,
rub5,
urb5,
loo3,
lor3,
lou3,
lur3,
oor3,
our3,
roo3,
2 letter words:
ko6,
bo4,
ob4,
lo2,
oo2,
or2,
ou2,
ur2,