Rather than creating a new post for every example we come across, let's try to keep them all here. As they are changed/fixed, I'll try to keep a running tally here. This way, if there are any issues or questions that pop up, we can discuss in one place :)
I had a look at the list of tags using the Stack Exchange Data Explorer and used a regex expression to find all the tags using 's' as a suffix to find most of the plurals.
Also these tags are similar enough to be merged, or revised:
There are probably many more missing, I honestly didn't expect to find so many results.
Many of these tags perhaps shouldn't exist or should have their scope revised.