You could swap the words motion and action in this article, and it wouldn't change the meaning. i.e. why not: action: just doing something, whatever motion: ma

You could swap the words motion and action in this article, and it wouldn't change the meaning. i.e. why not: action: just doing something, whatever motion: making forward progress towards a goal. movement The words only server as placeholders -- they might as well be X and Y. Break out a dictionary once in a while.