Here's what rhymes with iffirm.
firm therm term affirm germ sperm worm infirm terme berm perm squirm corm confirm reaffirm isotherm endosperm reconfirm gymnosperm wheatgerm angiosperm Words that almost rhyme with iffirm
fern turn learn burn stern discern tern yearn churn spurn return adjourn quern sauterne concern overturn upturn taciturn nocturne subaltern unconcern