5 letter words:
broil7,
brool7,
buroo7,
oboli7,
4 letter words:
birl6,
biro6,
blur6,
boil6,
bolo6,
bool6,
boor6,
brio6,
broo6,
burl6,
lobi6,
lobo6,
obol6,
loir4,
loor4,
lour4,
olio4,
roil4,
roul4,
3 letter words:
bio5,
boi5,
boo5,
bor5,
bro5,
bru5,
bur5,
lib5,
lob5,
obi5,
obo5,
orb5,
rib5,
rob5,
rub5,
urb5,
loo3,
lor3,
lou3,
lur3,
oil3,
oor3,
our3,
roo3,
2 letter words:
bi4,
bo4,
ob4,
io2,
li2,
lo2,
oi2,
oo2,
or2,
ou2,
ur2,