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5 letter words:

groks10,

4 letter words:

grok9, kors8, rusk8, souk8, rugs5, ours4, sour4,

3 letter words:

kor7, kos7, suk7, gor4, gos4, rug4, ors3, our3, sou3,

2 letter words:

go3, or2, os2, so2, us2,