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5 letter words:

umbos9,

4 letter words:

bums8, mobs8, umbo8, sumo6,

3 letter words:

bum7, mob7, bos5, bus5, mos5, mus5, oms5, sob5, som5, sub5, sum5, sou3,

2 letter words:

bo4, mo4, mu4, om4, um4, os2, so2, us2,