I think that "synonyms" and "word-choice" tags cover intersecting sets of questions.
The "synonyms" tag doesn't have a wiki, so there is hardly a chance to find out what the tag was intended for. It now covers 3 questions: "народ vs люди", "synonyms for срач" and "мир vs. свет".
The "word-choice" tag wiki tells that it is for questions about difference in usage and meaning.
Some other language sites also have both tags, but I cannot figure out what is the difference between them. Can someone explain me how these tags differ?