Do these need to be separate tags or should they be synonymized? I'm of the opinion that they should be separate and the resume tag wiki should no longer refer to CVs.
In most contexts, CV ( Curriculum vitae ) and resume are used interchangeably. Different countries and different industries tend to prefer one term over another. An academic job in any country will typically ask for a CV, a non-academic job in the United States will typically ask for a resume, other countries (such as most European companies) will prefer the term CV. In most cases, everyone is talking about the same thing.
I haven't found a resume question insofar that specifically asks about resumes instead of CVs (haven't looked that hard though), I think they are used interchangeably and we should make them synonyms. And although it might go against the tags' question count, I'd propose CV as the master tag, as it's the most recognizable term of the two (worldwide).
My usual rule of thumb for tags is their role as interesting/ignored and I just can't see how someone would be interested in one but not the other, or want to ignore one but not the other. If we make them synonyms, someone searching for one will find both. I think there are some subtle differences (I occasionally write up an academic CV for myself that's very different from my resume) but not worthy of a separate tag.
I went and approved a synonym request; CV and Resume tagged questions will now show up as resume on questions.
I went with Resume as the master tag since Resume was the more common usage on questions and in the US, the only place I know of where the distinction is relevant, CVs are much more rare and elaborate; it makes sense to keep the most common semantic usage IMO.
We can always undo this later too.