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