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5 letter words:

coups9,

4 letter words:

cops8, coup8, cups8, cusp8, scop8, scup8, opus6, soup6,

3 letter words:

cop7, cup7, cos5, ops5, pus5, sop5, sup5, upo5, ups5, sou3,

2 letter words:

op4, up4, os2, so2, us2,