When I think of the word ‘pebble’ the words that come to mind are: shiny, smooth, polished, round, wet… But the word ‘stone’ conjures much more. In addition to the preceding, I might also think of: rough, lumpen, angular, pitted, sharp… and then there are also stones so important we have added names to them: hearth stone, lode-stone, philosophers stone, millstone, whet stone, altar stone, headstone… Some even have their own gods.

All pebbles are stones, not all stones are pebbles.