As you can see, there are differences in hyphens, whether it says model or pi, etc. To make them consistent, I recommend these renames/retags:
pi1 (only has 11 questions, so should retag to specific models)
raspberry-pi-foundation > pi-foundation (I created this tag for two specific questions; however it has been frequently misused (presumably) because it is the only tag with the full word 'raspberry' in it. By renaming it, it will be pushed below the model tags in search and hopefully not abused)
This means we will end up with:
Optionally we can add
raspberry- to the start of every tag for better searchablility.