"bug" would be a meta-tag, i.e. a tag that is meaningless on its own or is only useful in conjunction with other more descriptive tags. We do not create such tags and in fact we [actively hunt and remove them][1].

The [tag:less] tag already exists on the main site and does not need to be created. 

  [1]: https://meta.superuser.com/search?q=meta%20tag