Excel's rhymes with:
excels, excels, cell's, cells, cells', cels, excels, outsells, resells, sells, selz
Excel's sounds like:
eagle's, eagles, eccles, echols, eckels, eckles, ecology, eggshells, eglise, eichholz, equalize, equalizes, equals, eslick, excels, exiles, eyeglass, eyeglasses, ezell's