Arrhythmia rhymes with:
academia, anemia, bermea, bohemia, bulemia, bulimia, calamia, euphemia, femia, flammia, geremia, hermia, hypoglycemia, hypothermia, ischemia, islamiya, jeremia, lamia, leukemia, lumia, macadamia, mesopotamia, uremia, vremya
Arrhythmia sounds like:
aardema, aerodyne, airtime, ardeen, arden, ardene, ardin, ardine, ardoin, ardoyne, arduini, aretina, ariadne, artino, artman, arton