The tag bugs has two synonyms: bug and bug-fixing. Both redirect to bugs. However, neither bugfix nor bug-fixes have synonyms.
- bug should continue to be classified as a synonym of bugs
- bugfix should be classified as a synonym of bug-fixes
- bug-fixing should be changed from a synonym for bug, and reclassified as a synonym for bug-fixes
EDIT Merge them into one tag.
Are users actually differentiating between a bug and a bug fix? This might be an unnecessarily "granular" distinction. It would be better to roll all five tags- bug, bugs, bugfix, bug-fixes and bug-fixing, into a single bugs tag.