I was looking for something about bookmarking conversations in chat and I have noticed that the questions I found were tagged either by conversation or by bookmark or by chat-bookmarks. Only the last one has tag-excerpt and tag-wiki.
The three tags seem to me very similar, at least (bookmark) and (chat-bookmarks) seem to be used for the same purpose, when I look at the questions currently having these tags. To me the name (chat-bookmarks) seem definitely better than (bookmark), since it is much less ambiguous. (Bookmark has more general meaning and I found questions in this tag like Can I bookmark a question on Stack Overflow? or Bookmarklet: Show unanswered questions (0-answer, not no-accepted-answer) which have nothing to do with chat.)
The tag (conversation) contains similar questions. Although not all question which have this tag at the moment are chat related.
I think that having good tags improves possibility to search for questions about some topic. So I am asking for advice what to do with these closely related tags?