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It's not only exercises (70). There are also (at least) the tags:
These are all part of the more Generic Tag homework, and I believe they should be removed to avoid confusion.
No. No difference and we need only one tag.
All pedagogical questions are pedagogical questions.
A note about the various comments here:
'A' is a type of 'B' does not mean 'A' and 'B' are synonyms. Synonyms are something which are exact duplicates - like regex and regular-expression. There are many examples of hierarchical tag relationships on SO, and I think the mods have decided to never have any kind of hierarchical relationships between tags.