5 letter words:
boric9,
4 letter words:
crib8,
biro6,
boor6,
brio6,
broo6,
coir6,
3 letter words:
cob7,
bio5,
boi5,
boo5,
bor5,
bro5,
coo5,
cor5,
obi5,
obo5,
orb5,
orc5,
rib5,
rob5,
roc5,
oor3,
roo3,
2 letter words:
bi4,
bo4,
ob4,
io2,
oi2,
oo2,
or2,