There have been a number of paying passengers on orbital missions in the past, and it is likely there will be many, many more in the future, and not only on orbital missions.
I'm thinking that passengers and crew are exclusive of each other, the only other group would be stow-aways.
In the past have all of the above been called astronauts (or equivalent in other languages)? Will this change in the future, when passengers may outnumber the crew? This question got me thinking about the distinction.