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8 letter words:

infixion18,

5 letter words:

infix15, inion5,

4 letter words:

fini7, fino7, foin7, info7, noni4,

3 letter words:

fix13, fox13, nix10, nox10, fin6, fon6, inn3, ion3, non3,

2 letter words:

ox9, xi9, if5, of5, in2, io2, no2, oi2, on2,