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6 letter words:

fusion9,

5 letter words:

finos8, foins8, infos8,

4 letter words:

fino7, fins7, foin7, fons7, funs7, info7, ions4, nous4, onus4,

3 letter words:

fin6, fon6, fou6, fun6, ifs6, ins3, ion3, nos3, nus3, ons3, sin3, son3, sou3, sun3, uns3,

2 letter words:

if5, of5, in2, is2, no2, nu2, oi2, on2, os2, si2, so2, un2, us2,