6 letter words:
bookoo12,
5 letter words:
obiit7,
oobit7,
4 letter words:
boko10,
book10,
kobo10,
koto8,
tiki8,
toko8,
took8,
foot7,
bito6,
boot6,
obit6,
3 letter words:
kif10,
bok9,
kob9,
fib8,
fob8,
kit7,
koi7,
oik7,
fit6,
oft6,
oof6,
bio5,
bit5,
boi5,
boo5,
bot5,
obi5,
obo5,
oot3,
too3,
2 letter words:
ki6,
ko6,
if5,
of5,
bi4,
bo4,
ob4,
io2,
it2,
oi2,
oo2,
ti2,
to2,