5 letter words:
bucko13,
cobia9,
4 letter words:
back12,
bock12,
buck12,
bauk10,
boak10,
bouk10,
buik10,
cauk10,
kuia8,
ciao6,
obia6,
3 letter words:
bok9,
ick9,
kab9,
kob9,
auk7,
bac7,
cab7,
cob7,
cub7,
kai7,
koa7,
koi7,
oak7,
oik7,
oka7,
ouk7,
abo5,
bio5,
boa5,
boi5,
oba5,
obi5,
oca5,
2 letter words:
ka6,
ki6,
ko6,
ab4,
ba4,
bi4,
bo4,
ob4,
ai2,
io2,
oi2,
ou2,