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