5 letter words:
bokos11,
books11,
kobos11,
kotos9,
stook9,
tokos9,
boost7,
boots7,
4 letter words:
boko10,
boks10,
book10,
bosk10,
kobo10,
kobs10,
koto8,
sook8,
toko8,
took8,
boos6,
boot6,
bots6,
obos6,
stob6,
oots4,
soot4,
3 letter words:
bok9,
kob9,
kos7,
tsk7,
boo5,
bos5,
bot5,
obo5,
obs5,
sob5,
oos3,
oot3,
sot3,
too3,
2 letter words:
ko6,
bo4,
ob4,
oo2,
os2,
so2,
st2,
to2,