7 letter words:
bookful16,
5 letter words:
kloof12,
4 letter words:
folk11,
boko10,
book10,
bouk10,
bulk10,
kobo10,
bufo9,
flub9,
kolo8,
look8,
oulk8,
fool7,
foul7,
loof7,
bolo6,
bool6,
lobo6,
obol6,
3 letter words:
bok9,
kob9,
fob8,
fub8,
ouk7,
flu6,
fou6,
oof6,
ufo6,
boo5,
lob5,
obo5,
loo3,
lou3,
2 letter words:
ko6,
of5,
bo4,
ob4,
lo2,
oo2,
ou2,