5 letter words:
borks11,
brusk11,
4 letter words:
bork10,
bosk10,
busk10,
kobs10,
kors8,
rusk8,
souk8,
bros6,
burs6,
orbs6,
robs6,
rubs6,
sorb6,
urbs6,
ours4,
sour4,
3 letter words:
kob9,
kor7,
kos7,
suk7,
bos5,
bro5,
bur5,
bus5,
orb5,
rob5,
rub5,
sob5,
sub5,
urb5,
ors3,
our3,
sou3,
2 letter words:
bo4,
or2,
os2,
so2,
us2,