I am looking for a term to describe expressing an idea in many different forms yet the meaning remains the same in each rendition.
An example of this:
The Australians, Australians, the Australian people, the people of Australia, Australia's people etc.
All the phrases above virtually express the same thing yet they are all different, lexico-grammatically speaking.
Thus, the term synonym does not work here. I have also come across the idea of periphrasis but that also has a restrictive definition that does not include my example.