Here's what rhymes with stiffn.
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 penmen pitchmen lawmen oilmen weathermen businessmen handymen conmen middlemen minutemen anchormen councilmen patrolmen comedienne signalmen tragedienne equestrienne Words that almost rhyme with stiffn
them hem femme heme feng sheng stem gem mem rem hmm pm eadem ppm morpheme diadem blaspheme condemn rpm demesne cairn fluorescein moderne relearn ramequin