Here's what rhymes with siffn.
then hen sen fn fen when men ten den pen ben ken yen pn wen wenn chen denn jen ren wren again againe glen amen cayenne lawmen oilmen penmen pitchmen weathermen businessmen conmen middlemen signalmen handymen minutemen anchormen councilmen comedienne equestrienne patrolmen tragedienne Words that almost rhyme with siffn
them hem femme heme feng sheng stem gem mem rem hmm pm eadem morpheme condemn ppm rpm diadem blaspheme cairn demesne fluorescein moderne relearn ramequin