Propionic rhymes with:
avionic, embryonic, ganglionic, histrionic, napoleonic, nucleonic, allophonic, audiotronic, avionic, blahnik, bubonic, catatonic, chronic, conic, connick, demonic, diasonic, diatonic, electronic, embryonic, fibronic, flextronic, ganglionic, gnomonic, harmonic, 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, respironic, sardonic, sonic, supersonic, symphonic, synchronic, tectonic, telectronic, telephonic, tonic, tranzonic, tronic, ultrasonic, vanik, varitronic
Propionic sounds like:
parfums, perfumes, perfuming, peruvians, pervomaiskaya, prepaying, prepping, previewing, probing, proofing, propping, provance, provenance, provence, provencio, provenience, provenza, province, province's, provinces, proving, purifying, purveying, purviance