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