6 letter words:
spooks12,
5 letter words:
books11,
bosks11,
kobos11,
spook11,
sooks9,
4 letter words:
book10,
bosk10,
kobo10,
kobs10,
kops10,
bops8,
koss8,
sook8,
boos6,
boss6,
oops6,
poos6,
sobs6,
sops6,
3 letter words:
kob9,
kop9,
bop7,
kos7,
boo5,
bos5,
ops5,
poo5,
sob5,
sop5,
sos3,
2 letter words:
bo4,
op4,
os2,
so2,