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6 letter words:

ionium8,

5 letter words:

imino7, onium7,

4 letter words:

mini6, mino6, muni6, muon6,

3 letter words:

moi5, mon5, mou5, mun5, nim5, nom5, ion3, uni3,

2 letter words:

mi4, mo4, mu4, om4, um4, in2, io2, no2, nu2, oi2, on2, ou2, un2,