The best way to explain it is to make a good statement rather than making a long and very technical definition that is hard for the reader to understand. So here is my explanation " All trading is an investment but not all investment is trading". It simply means that even trading itself is considered as investment. But investment has many forms aside from just trading, it could be investment in networking, loans, business and many more.
You defined it as a comparison that a good definition. But if people need to decide on choosing between trading and investing they also need the similarities of the two. In every trading and investment there is always a risk and one should always have a source of bitcoin before starting one of these. So for further decision it always depend on the people will choose. Because it is better to do things that you really like to do for you to do it with your best and to earn with no problem.