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8 letter words:

suffixes21,

6 letter words:

suffix19,

5 letter words:

fixes15, sixes12, fiefs11, fifes11, fuses8, seifs8, issue5,

4 letter words:

effs10, fief10, fife10, fess7, feus7, fuse7, fuss7, seif7, seis4, sues4, uses4,

3 letter words:

fix13, sex10, six10, xis10, eff9, iff9, efs6, fes6, feu6, fie6, ifs6, ess3, sei3, sis3, sue3, use3,

2 letter words:

ex9, xi9, xu9, ef5, fe5, if5, es2, is2, si2, us2,