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