Harmonic rhymes with:
philharmonic, demonic, gnomonic, hegemonic, mnemonic, philharmonic, pneumonic, allophonic, audiotronic, avionic, blahnik, bubonic, catatonic, chronic, conic, connick, demonic, diasonic, diatonic, electronic, embryonic, fibronic, flextronic, ganglionic, gnomonic, hedonic, hegemonic, histrionic, hyaluronic, hydroponic, hypersonic, hypertonic, ionic, ironic, isoelectronic, isotonic, kronick, laconic, lasersonic, leptonic, masonic, medtronic, microelectronic, miltonic, mnemonic, monophonic, napoleonic, neoplatonic, nucleonic, ovonic, panasonic, personic, pharaonic, philharmonic, phonic, photronic, planktonic, plantronic, platonic, plutonic, pneumonic, polyphonic, propionic, respironic, sardonic, sonic, supersonic, symphonic, synchronic, tectonic, telectronic, telephonic, tonic, tranzonic, tronic, ultrasonic, vanik, varitronic
Harmonic sounds like:
haering, hairiness, harangue, harangues, haring, harm's, harmening, harmes, harming, harmon's, harmonica, harmonics, harmonies, harmonious, harmonize, harmonizes, harms, harnack, harnage, harness, harnesses, harnisch, harnish, harnois, harring, harrowing, hearing, hearing's, hearings, hearns, heironimus, hering, herman's, hermance, hermanns, hermans, hermes, hermias, hermosa, herms, heroin's, heroines, heron's, herons, herring, herrings, herringshaw, herronimo's, heuring, hiring, hirings, hiromasa, hirons, hormones, hormuz, horn's, hornack, hornak, hornick, hornig, hornik, horning, horns, hornung, hornyak, hronek, hurrying