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