As the person who created the tag (sorry!) I'd like to explain why I did; while I'm not sure if my reasoning was solid, I'm fairly certain that explaining can't hurt.
This was my question. It's about the similarities and differences between some words that are just defined as "or" in my dictionary. Since it's been upvoted, I doubt it's a bad question, but having read a few arguments for and against grammar on other sites, I'm leaning against it myself.
I added it originally because I was, in part, asking if I could use "-ve" in a certain way. While I'm not sure if that's syntax or grammar, my gut feeling says grammar because it's about word usage. Since it's about grammar, adding the tag felt appropriate.
However, we need to define what it means clearly if we want to keep using it. For example, asking what case a word should be in would be grammar; asking for a translation with a piece of unknown grammar would not (it would be unknown-grammar).