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5 letter words:

rumbo9,

4 letter words:

borm8, ombu8, umbo8, roum6,

3 letter words:

bum7, mob7, bor5, bro5, bru5, bur5, mor5, mou5, orb5, rob5, rom5, rub5, rum5, urb5, our3,

2 letter words:

bo4, mo4, mu4, ob4, om4, um4, or2, ou2, ur2,