Idec rhymes with:
hajduk, hydock, sajdak, baldock, bolduc, braddock, caddock, chaddock, craddock, cradock, fedak, gladdock, haddock, hajduk, hayduk, hodak, hudak, hudock, hydock, ladakh, maddock, madoc, madock, paddack, paddock, piddock, reddoch, riddock, rodak, ruddock, sajdak, shaddock, shadduck, zadoc, zadok
Idec sounds like:
idaho's, idea's, ideas, idiocy, idiotic, idiots, iodice, iodide's, iodides, it's, itasca, itch, itches, itchy, itek, ithaca, ithaca's, ito's, itochu, its, itsy, itzhak