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5 letter words:

union5,

4 letter words:

fino7, foin7, info7, noni4, noun4,

3 letter words:

fin6, fon6, fou6, fun6, ufo6, inn3, ion3, non3, nun3, uni3,

2 letter words:

if5, of5, in2, io2, no2, nu2, oi2, on2, ou2, un2,