We were just having a discussion on the use of meta tags on synonym-request posts. Some use discussion, while others use feature-request. We should have a standard for this, instead of picking tags willy-nilly.
I'd go with discussion. Not exactly because it's perfectly suited for the job... but because the other three required tags are more clearly incorrect. And it does sort of fit; it'll probably take some community discussion to hash out whether a given synonym is correct or not before anyone takes any action.