Below, when I say "main tag" I mean the tag that you want the other tag to redirect to (generally the tag with more votes). I'll call the tag re-directs to the main tag the "sub-tag."
When the synonyms privileges page says it's only possible to create synonyms for tags for which you have five or more rep, does that mean five rep for the sub-tag or main tag?
Do I propose a synonym by clicking on the synonyms link in the tag wiki for the main tag or the sub-tag?