Southern's rhymes with:
northern's, caverns, cisterns, cockburn's, eastern's, governs, hepburn's, interns, irons, lanterns, mcgovern's, moderns, northern's, northwestern's, patterns, rathburne's, saturn's, saturns, severns, southeastern's, swinburne's, swinburnes, taverns, western's, westerns
Southern's sounds like:
saturn's, saturns, sauternes, scattering, sequestering, shattering, shoestring, shuddering, shuttering, sidearms, sistrunk, squadrons, staring, starnes, starns, starring, stearns, stearns's, steering, stern's, sternness, sterns, stirring, stirrings, storing, storm's, stormes, storminess, storming, storms, straining, strains, strang, strange, strangis, strangwayes, stransky, straying, streaming, streams, streng, strenuous, string, strings, stringy, stronach, strong, strumming, strums, strung, strunk, strunk's, sturmans, stuttering, suturing