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5 letter words:

croze16,

4 letter words:

zero13, cero6, core6, ergo5, goer5, gore5, ogre5,

3 letter words:

coz14, cog6, cor5, orc5, rec5, roc5, ego4, erg4, gor4, reg4, ore3, roe3,

2 letter words:

go3, er2, oe2, or2, re2,