5 letter words:
bucko13,
4 letter words:
cowk13,
wock13,
bock12,
buck12,
boko10,
book10,
bouk10,
cook10,
kobo10,
3 letter words:
kow10,
wok10,
bok9,
kob9,
wow9,
bow8,
cow8,
cob7,
cub7,
ouk7,
woo6,
boo5,
coo5,
obo5,
2 letter words:
ko6,
ow5,
wo5,
bo4,
ob4,
oo2,
ou2,