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7 letter words:

fussing11,

6 letter words:

fusing10,

5 letter words:

fungi9, signs6, sings6, snugs6, suing6, using6, nisus5, sinus5,

4 letter words:

figs8, fugs8, fins7, funs7, fuss7, gins5, gnus5, guns5, sign5, sing5, snug5, sung5, sins4, suns4,

3 letter words:

fig7, fug7, fin6, fun6, ifs6, gin4, gnu4, gun4, ins3, nus3, sin3, sis3, sun3, uns3,

2 letter words:

if5, in2, is2, nu2, si2, un2, us2,