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