words ending in onic

2 Syllables
chronic, conic, ionic, phonic, sonic, tonic

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3 Syllables
agonic, atonic, bubonic, carbonic, cyclonic, demonic, draconic, embryonic, euphonic, harmonic, histrionic, iconic, ironic, laconic, masonic, mnemonic, parsonic, platonic, plutonic, pneumonic, sardonic, slavonic, subsonic, symphonic, tectonic, transonic
4 Syllables
diatonic, electronic, enharmonic, hegemonic, hypersonic, inharmonic, macaronic, napoleonic, philharmonic, polyphonic, stereophonic, super-sonic, supersonic, telephonic, ultrasonic
5 Syllables
architectonic