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