Here's what rhymes with converion.
ovarian carrion agrarian clarion barbarian sectarian vulgarian librarian vegetarian sanitarian seminarian cnidarian authoritarian egalitarian antiquarian libertarian communitarian trinitarian veterinarian octogenarian nonsectarian centenarian proletarian nonagenarian sexagenarian humanitarian utilitarian totalitarian disciplinarian parliamentarian latitudinarian septuagenarian valetudinarian Words that almost rhyme with converion
barium aquarium honorarium vivarium chameleon nobelium sanitarium planetarium ferryman ferrymen thespian lesbian vestrymen vestryman pedestrian equestrian