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