Nephridium rhymes with:
chriptosporidium, cryptosporidium, iridium, chriptosporidium, cryptosporidium, idiom, iridium, presidium, chriptosporidium, compendium, cryptosporidium, idiom, indium, iridium, medium, myocardium, odiaum, palladium, plasmodium, podium, presidium, radium, rhodium, sodium, stadium, tedium, vanadium