Metallic's rhymes with:
italics, alix, calix, calyx, fralix, italics, acrylics, alcoholics, alix, calix, calyx, catholics, cowlicks, ehrlich's, felix, fralix, gunlicks, helix, hydraulics, interpublic's, italics, non-catholics, public's, publics, publix, relics, republic's, republics, symbolics, wallich's, workaholics
Metallic's sounds like:
madlock, mandela's, mantle's, mantles, matala's, matelski, matlack, matlick, matlock, mattel's, matulich, matulis, meatless, medals, medlock, mendel's, metal's, metallic, metallica, metallica's, metals, metals', methodologies, methodology, middlesex, mindless, model's, models, models', modules, mondale's, montel's, motels, mountleigh, mountleigh's, muddles, mutual's, mythology