Hedonic rhymes with:
sardonic, allophonic, audiotronic, avionic, blahnik, bubonic, catatonic, chronic, conic, connick, demonic, diasonic, diatonic, electronic, embryonic, fibronic, flextronic, ganglionic, gnomonic, harmonic, 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
Hedonic sounds like:
haitians, haitiens, hating, haydn's, heading, headings, heating, hedding, heeding, hiding, hitting, hodding, hoodwink, houdini's, houten's, huadong, hutnick, hutton's