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