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7 letter words:

infirms12,

6 letter words:

infirm11, mirins8,

5 letter words:

firms10, finis8, firns8, minis7, mirin7,

4 letter words:

firm9, fins7, firn7, firs7, rifs7, mini6, miri6, mirs6, nims6, rims6, iris4, nisi4, rins4,

3 letter words:

fin6, fir6, ifs6, rif6, ism5, mir5, mis5, nim5, rim5, sim5, ins3, rin3, sin3, sir3, sri3,

2 letter words:

if5, mi4, in2, is2, si2,