The Zombie Stack Exchanges That Just Won't Die
As of this writing, public-libraries has 12 questions and public-library has 2. Obviously these are intended to be the same category, and plurals appear to be the order of the day, so I've submitted retagging edits for the two public-library questions. However, this may not be sufficient to indicate a need for a synonym.
I believe that this does indicate a need for a synonym, as clearly we are experiencing splintering in the tag structure and single-to-plural conversion is intuitive and noncontroversial.