The tag "references" is about requests for references. Fine. That's a useful tag. But the tags "textbooks" and "books" are synonyms of that tag. That leaves us with no tag I can find for questions about books -- how they get written, how they get published, best practices for writing them, why they do things, and so on.
I'm not sure how to resolve this. Can tags be "unsynonymized"? I can see that that might cause problems, but I am not very knowledgeable about the meta part of this site or stack exchange in general.
Any ideas?