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5 letter words:

cooms9,

4 letter words:

coms8, coom8, mocs8, coos6, moos6, ooms6, soom6,

3 letter words:

moc7, coo5, cos5, moo5, mos5, oms5, oom5, soc5, som5, oos3,

2 letter words:

mo4, om4, oo2, os2, so2,