All of the stones

Along my journey, I encountered many stones.
The stones in the path I follow, so many sizes and colors and textures they are.
The stone in the stream that I stepped on to cross it.
The stone in my shoe that caused me discomfort as I walked, until I took it out.
The stone on which I laid back and warmed myself on.
The stone I put in my slingshot to hunt rabbits to eat.
The stones I skipped across the river to pass the time.
Is it a rock? A pebble? A stone?
Aren’t they are all the same?