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