Catatonic rhymes with:
diatonic, isotonic, neoplatonic, platonic, diatonic, hypertonic, isotonic, leptonic, miltonic, neoplatonic, planktonic, platonic, plutonic, tectonic, tonic
Catatonic sounds like:
cadence, cadences, cadmus, cascading, casting, castings, castonguay, catanese, cattanach, cautioning, cautions, ceding, chattanooga, chattanooga's, chattanuga, chatting, cheating, chestang, chetniks, chiding, chitinous, citations, citing, coasting, coating, coatings, codding, coding, coexistence, coexisting, costanza, costanzo, costing, costumes, cotton's, cottons, cuauhtemoc, custodians, customize, customizes, customs, cuteness, cutting, cuttings