Idiom rhymes with:
chriptosporidium, cryptosporidium, iridium, nephridium, presidium, chriptosporidium, compendium, cryptosporidium, indium, iridium, medium, myocardium, nephridium, odiaum, palladium, plasmodium, podium, presidium, radium, rhodium, sodium, stadium, tedium, vanadium
Idiom sounds like:
iden, ideonomy, idona, idoney, idonia, iduna, iodine, itami, item, iten