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6 letter words:

osmous8,

5 letter words:

mosso7, sumos7,

4 letter words:

moos6, moss6, muss6, soms6, sumo6, sums6, sous4,

3 letter words:

moo5, mos5, mus5, oms5, som5, sum5, sos3, sou3,

2 letter words:

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