That it seems to mean something is due to an image of well-known things.
Money is not always used to buy things which can be pointed to, e.
Nor is it true that there are discrete groups of things called "games".
It is used in different contexts because there is a transition between similar things called "good", a transition which continues, it may be, to things which bear no similarity to earlier members of the series.
The reason for using the word "good" is that there is a continuous transition from one group of things called good to another.
It is what is responsible for people saying that punishment must be one of three things, revenge, a deterrent, or improvement.
This way of looking at things comes out in such questions as, Why do people hunt?, Why do they build high buildings?
A tendency which has come into vogue with the modern sciences is to explain certain things by evolution.
One of the ways of looking at questions in ethics about good is to think that all things said to be good have something in common, just as there is a tendency to think that all things we call games have something in common.
Plato's talk of looking for the essence of things was very like talk of looking for the ingredients in a mixture, as though qualities were ingredients of things.