Here's what rhymes with hellium.
nobelium Words that almost rhyme with hellium
barium ovarian carrion vivarium aquarium chameleon clarion honorarium agrarian sectarian sanitarium vulgarian librarian barbarian vegetarian sanitarian seminarian cnidarian authoritarian libertarian veterinarian planetarium centenarian egalitarian proletarian antiquarian trinitarian nonsectarian humanitarian utilitarian totalitarian disciplinarian octogenarian nonagenarian sexagenarian communitarian septuagenarian valetudinarian parliamentarian latitudinarian fermium gentium requiem biennium millennium proscenium lutetium technetium lawrencium compendium quadrennium endometrium