6 letter words:
booksy15,
5 letter words:
booky14,
bosky14,
kybos14,
sybow13,
bokos11,
books11,
kobos11,
boyos10,
4 letter words:
kybo13,
kows11,
woks11,
yoks11,
bisk10,
boko10,
boks10,
book10,
bosk10,
kobo10,
kobs10,
yows10,
ywis10,
bows9,
boyo9,
boys9,
swob9,
sybo9,
yobs9,
kois8,
oiks8,
skio8,
sook8,
oosy7,
woos7,
bios6,
bois6,
boos6,
obis6,
obos6,
3 letter words:
kow10,
sky10,
wok10,
yok10,
bok9,
kob9,
swy9,
yow9,
bow8,
boy8,
bys8,
yob8,
kis7,
koi7,
kos7,
oik7,
sik7,
ski7,
oys6,
sow6,
soy6,
wis6,
woo6,
wos6,
yos6,
bio5,
bis5,
boi5,
boo5,
bos5,
obi5,
obo5,
obs5,
sib5,
sob5,
ios3,
iso3,
oos3,
2 letter words:
ky9,
by7,
ki6,
ko6,
ow5,
oy5,
wo5,
yo5,
bi4,
bo4,
ob4,
io2,
is2,
oi2,
oo2,
os2,
si2,
so2,