5 letter words:
bokos11,
books11,
kobos11,
4 letter words:
bisk10,
boko10,
boks10,
book10,
bosk10,
kobo10,
kobs10,
kois8,
oiks8,
skio8,
sook8,
bios6,
bois6,
boos6,
obis6,
obos6,
3 letter words:
bok9,
kob9,
kis7,
koi7,
kos7,
oik7,
sik7,
ski7,
bio5,
bis5,
boi5,
boo5,
bos5,
obi5,
obo5,
obs5,
sib5,
sob5,
ios3,
iso3,
oos3,
2 letter words:
ki6,
ko6,
bi4,
bo4,
ob4,
io2,
is2,
oi2,
oo2,
os2,
si2,
so2,