Update: 3 years later, there has been no change.
While I support deletion of scope in general, until that happens (if that happens), in any case variable-scope should a synonym for scope.
Current tag descriptions:
scope: Scope is an enclosing context where values and expressions are associated. Use this tag for questions about different types of scope as well for questions where scope may be unclear.
variable-scope: A variable scope is the context within a computer program in which a variable name is valid and can be used.
While there are valid differences between the two; it appears that many questions tagged scope should have been tagged variable-scope instead: The reason is because most people would refer to that as just "scope". I do not feel there is much value in separating the two anyways (in fact, I don't feel like their is much value in either of these tags, in all cases the general language tag is appropriate -- also, "scope" itself seems frequently misused to refer specifically to Ruby on Rails'
I think the blurry line between these two tags, the common misuse of one when the other (or something else entirely) was meant, and the relative non-usefulness of these tags in general warrants a merge.
Even better would be a blacklist of both, after manually retagging the Ruby on Rails