7 letter words:
rubious9,
6 letter words:
krubis12,
5 letter words:
birks11,
borks11,
brisk11,
brusk11,
krubi11,
kurus9,
biros7,
brios7,
rubus7,
4 letter words:
birk10,
bisk10,
bork10,
bosk10,
busk10,
kobs10,
irks8,
kirs8,
kois8,
kors8,
kris8,
kuru8,
risk8,
rusk8,
souk8,
bios6,
biro6,
brio6,
bris6,
bros6,
burs6,
obis6,
orbs6,
ribs6,
robs6,
rubs6,
sorb6,
urbs6,
ours4,
sori4,
sour4,
urus4,
3 letter words:
kob9,
irk7,
kir7,
kis7,
koi7,
kor7,
kos7,
ski7,
suk7,
bio5,
bis5,
bos5,
bro5,
bur5,
bus5,
obi5,
orb5,
rib5,
rob5,
rub5,
sib5,
sob5,
sub5,
urb5,
ors3,
our3,
sir3,
sou3,
sri3,
2 letter words:
ki6,
bi4,
bo4,
is2,
oi2,
or2,
os2,
si2,
so2,
us2,