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9 letter words:

officious17,

5 letter words:

coffs13, cuffs13, scoff13, scuff13, coifs10, coofs10, cuifs10, ficus10, focus10,

4 letter words:

coff12, cuff12, offs10, coif9, coof9, cuif9, fico9, fisc9, foci9, fuci9, coos6,

3 letter words:

iff9, off9, fou6, ifs6, cis5, coo5, cos5, sic5, sou3,

2 letter words:

if5, of5, is2, oi2, os2, si2, so2, us2,