rock vs stone

stone: [noun] a concretion of earthy or mineral matter:. such a concretion of indeterminate size or shape. rock. a piece of rock for a specified function: such as. a building block. a paving block. a precious stone : gem. gravestone. grindstone. whetstone. a surface upon which a drawing, text, or design to be lithographed is drawn or transferred. live wales vs iran