Spartz rhymes with:
departs, imparts, part's, parts, parts', art's, arts, artz, bart's, barts, bartz, carts, charts, dart's, darts, departs, descartes's, hart's, harts, hartz, heart's, hearts, imparts, k-mart's, kartes, mart's, marts, martz, part's, parts, parts', schartz, smarts, starts, tarts, upstarts
Spartz 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, spirit's, spirits, sporadic, sport's, sports, sports', spreads, sprouts, spurts, subverts, supports