Platonic rhymes with:
neoplatonic, neoplatonic, catatonic, diatonic, isotonic, neoplatonic, catatonic, diatonic, hypertonic, isotonic, leptonic, miltonic, neoplatonic, planktonic, plutonic, tectonic, tonic
Platonic sounds like:
paulding, pelting, piloting, plaiting, plateauing, plating, platinum's, platoons, plaything, playthings, pleading, pleadings, plodding, plotnick, plotting, plutonic, politeness, polluting, populating, populations