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7 letter words:

viscous12,

6 letter words:

viscus11,

5 letter words:

cusso7,

4 letter words:

coss6, cuss6, sics6, sous4,

3 letter words:

vis6, cis5, cos5, sic5, sis3, sos3, sou3,

2 letter words:

is2, oi2, os2, si2, so2, us2,