Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
On our meta site, there are two different tags on-topic and scope but actually on-topic is synonyms of scope. Refer MSO.
Turns out there was already a suggested synonym which I have now approved. I also removed the off-topic tag from the three questions that had it.
So, on-topic is now a synonym of scope.