Sporadic rhymes with:
caddick, chadick, cradic, hladik, nomadic, radich, radick, sadek, sladek, tadic
Sporadic sounds like:
sabertech, sabortech, sabretech, schubert's, seaports, separates, sephardic, shepard's, shepherd's, shepherds, sheppard's, sheppards, shipyard's, shipyards, siefert's, spartacus, spartech, spartz, spirit's, spirits, sport's, sports, sports', spreads, sprouts, spurts, subverts, supports