8 letter words:
bankbook20,
6 letter words:
baboon10,
5 letter words:
kabob13,
baboo9,
nabob9,
aboon7,
4 letter words:
konk12,
kook12,
bank10,
bonk10,
book10,
knob10,
kobo10,
boob8,
kaon8,
koan8,
nook8,
boon6,
3 letter words:
kab9,
kob9,
bob7,
koa7,
oak7,
oka7,
abo5,
ban5,
boa5,
boo5,
nab5,
nob5,
oba5,
noo3,
ono3,
2 letter words:
ka6,
ab4,
ba4,
bo4,
an2,
na2,
no2,
on2,