Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
These three tags are pretty blatantly about the same piece of equipment:
I propose them to be merged. I prefer mortar-pestle to be the parent tag as it minimises confusion when auto-replaced for new users.
Done, merged all into mortar-and-pestle and created syns.