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5 letter words:

nills5, nulls5,

4 letter words:

ills4, lins4, nill4, nils4, nisi4, null4, sill4,

3 letter words:

ill3, ins3, lin3, lis3, nil3, nus3, sin3, sun3, uns3,

2 letter words:

in2, is2, li2, nu2, si2, un2, us2,