4 letter words:
cowk13,
wick13,
wock13,
bock12,
kiwi11,
boko10,
book10,
cook10,
kobo10,
3 letter words:
kow10,
wok10,
bok9,
ick9,
kob9,
bow8,
cow8,
cob7,
koi7,
oik7,
iwi6,
woo6,
bio5,
boi5,
boo5,
coo5,
obi5,
obo5,
2 letter words:
ki6,
ko6,
ow5,
wo5,
bi4,
bo4,
ob4,
io2,
oi2,
oo2,