I started this as a comment to Jeff's answer, but it became a bit long.. :-)
Probably just me, but I don't understand the need for the synonyms. If somebody starts typing
swĭ she'll see
switches as suggestions. And instead of just having one clear tag for it, some people will choose
switch and others
switches. Can't we (automagically) edit the least preferred to the preferred one, so that we keep the number of tags under control? At least a warning about a deprecated tag would be nice.
I'm also thinking about the other question on tags where the example of
class-D is given. Ideally it should be impossible to create one of them.