6 letter words:
burros8,
5 letter words:
biros7,
birrs7,
boors7,
brios7,
broos7,
burro7,
burrs7,
orris5,
4 letter words:
bios6,
biro6,
birr6,
boor6,
boos6,
brio6,
bris6,
broo6,
bros6,
brrr6,
burr6,
burs6,
obis6,
orbs6,
ribs6,
robs6,
rubs6,
sorb6,
urbs6,
ours4,
sori4,
sour4,
3 letter words:
bio5,
bis5,
boo5,
bos5,
bro5,
brr5,
bur5,
bus5,
obi5,
orb5,
rib5,
rob5,
rub5,
sib5,
sob5,
sub5,
urb5,
ors3,
our3,
sir3,
sou3,
sri3,
2 letter words:
bi4,
bo4,
is2,
oi2,
or2,
os2,
si2,
so2,
us2,