Grammar has come to be used as a general word for rules about how language works. Often it is used to mean anything other than spelling.
Most of the time that is a perfectly reasonable compromise. Most people know what you mean. I’ve noticed that when words like syntax are mentioned, the atmosphere changes. Some people don’t really know what is meant, & are uncomfortable. Others have a nasty feeling that if this conversation goes on much longer, they will be out of their depth.
If we can make it easier to sort out whatever needs fixing, surely it can’t be that important if we are a bit woolly about one word while we do it?
From time to time, that isn’t really good enough. For those rare occasions, here is a post to help.
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