Hart's rhymes with:
harts, hartz, heart's, hearts, art's, arts, artz, bart's, barts, bartz, carts, charts, dart's, darts, departs, descartes's, harts, hartz, heart's, hearts, imparts, k-mart's, kartes, mart's, marts, martz, part's, parts, parts', schartz, smarts, spartz, starts, tarts, upstarts
Hart's sounds like:
ha'aretz, hairdos, hardage, hardee's, hardick, hards, hardtke, hardwick, hardwicke, hardwoods, hardy's, haritos, harrod's, harrods, hartig, hartis, hartje, hartke, hartog, harts, hartsock, hartsoe, hartsook, hartsough, hartwick, hartwig, hartz, hartzog, hayward's, heart's, heartache, hearths, hearts, heartwise, herds, heretic, heritage, heritage's, heritages, herridge, hertig, hertog, hertz, hertzog, herwitz, hirohito's, hirtz, hoards, horatio's, horatius, hordes, horowitz, horwitz, howard's, hritz, hurtig, hurts, hurwitz