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6 letter words:

sniffy15,

5 letter words:

niffy14, niffs11, sniff11,

4 letter words:

iffy13, niff10, fins7, yins7,

3 letter words:

iff9, fin6, ifs6, nys6, sif6, sny6, syn6, yin6, ins3, nis3, sin3,

2 letter words:

fy8, if5, ny5, in2, is2, si2,