An example that I want to give is that I see two similar tags that mean the same thing:
As you can see the only difference is the "s" at the end I am sure there are more examples like this.
There might be multiple approaches for solving this.
From the moderator/admin getting a monthly report on similar tags and making modifications manually or something more brilliant.
I am not sure if anyone has noticed this and if it is an issue for others but I just wanted to point it out.