Appendix rhymes with:
bendix, bendix, thorndike's, thorndikes, addicks, angiomedics, bendix, benedix, biddix, budick's, electromedics, ferrofluidics, immunomedics, intermedics, isomedix, medic's, medics, paramedics, shaddix, thermedics, thorndike's, thorndikes
Appendix sounds like:
abounds, affinities, appendage, appendages, appendixes, appointees, appoints, avantek, avants