We have these tags which to me all mean about the same thing:
- ranking - 26
- site-ranking - 73
- page-ranking - 44
There was some discussion around some of these tags a few years ago with some votes for serps-ranking as a good canonical name for ranking (although there are no questions tagged with "serps-ranking" at all).
We also have these tags which I would leave separate:
- pagerank - Google algorithm for assigning link value to sites
- google-ranking - Ranking as applied specificially to the Google search engine