I realize that tags
- help to categorize and organize questions
- have "short" and "long" (my words) definitions, descriptions or discussions
Both are great qualities and yet there seems to be an overall emphasis or policy towards using existing tags rather than adding new ones.
I believe a comprehensive set of tags, along with their definitions, descriptions or discussions, constitutes a very useful knowledge-base on its own, and may even render certain questions unnecessary.
So, why not expand the role of the tag system to become a glossary?
How many times have you seen a question that could have been answered simply by browsing some tags?
If there is a consensus on the expansion of tags' purpose towards a glossary, further questions would have to be addressed: how to handle topic hierarchies, examples, cross-references, antonyms, (synonyms have already been discussed), etc. Those questions can wait, however.