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5 letter words:

buroo7,

4 letter words:

biro6, boor6, brio6, broo6,

3 letter words:

bio5, boi5, boo5, bor5, bro5, bru5, bur5, obi5, obo5, orb5, rib5, rob5, rub5, urb5, oor3, our3, roo3,

2 letter words:

bi4, bo4, ob4, io2, oi2, oo2, or2, ou2, ur2,