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5 letter words:

ruins5,

4 letter words:

nurs4, rins4, ruin4, runs4, unis4, urns4,

3 letter words:

ins3, nis3, nur3, nus3, rin3, run3, sin3, sir3, sri3, sui3, sun3, sur3, uni3, uns3, urn3,

2 letter words:

in2, is2, nu2, si2, un2, ur2, us2,