I'm in doubt about tag [noun] - it has only one question associated with it and possibly should be remapped to [nouns].
But I'm sure that [род] and [gender], [grammar] and [грамматика] should be made synonyms. By the way [grammar] has 10 questions tagged and [грамматика] has 40 associated questions.
Here is a list of tag pairs I have found so far:
- [род] and [gender]
- [grammar] and [грамматика]
- [prefixes] and [приставки]
- [stylistics] and [стилистика]