Word "North" censored in Book and Quill

When trying to distinguish between two towers that I’m building with a book that I’m logging data in for my own reference, I found that the phrase “North Tower” and even just the word “North” on its own is censored, and affects a bit of the surrounding text. The text doesn’t become censored until I hit “done” on the book. I can kind of understand censorship of the phrase “North Tower,” but censorship of the word “North” on it’s own seems a bit excessive, or a glitch.