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5 letter words:

korun9,

4 letter words:

grok9, gunk9, knur8, rung5, noun4,

3 letter words:

kor7, gnu4, gor4, gun4, nog4, rug4, nor3, nun3, our3, run3, urn3,

2 letter words:

go3, no2, nu2, on2, or2, un2,